HEADPHONES · YOUR NEXT FACE-OFF

OnePlus Buds 4 vs Sennheiser HD 660S2

Real specs. Clear sources.Exact models · UK & US buying links

Compared products

YOUR FIRST CHOICE

OnePlus Buds 4

5481158909 · Storm Gray · UK

Full product profile Official image

Exact model & source notes

OnePlus Buds 4 are true wireless earbuds with real-time adaptive ANC, a dual-driver design (11 mm woofer plus 6 mm tweeter) and Bluetooth 5.4 with LHDC 5.0, AAC and SBC, plus Steady Connect for extended range on select OnePlus phones. This record is the Storm Gray colour (UK SKU 5481158909); OnePlus rates it at 6 hours with ANC on and 24 hours with the case using AAC.

Specifications checked 26 Sept 2026.

Amazon links open search results. Check the exact variant, current price and availability with the retailer.

Manufacturer specifications

WHICH SUITS YOU?

Choose the OnePlus Buds 4 for

A wireless connection

Choose the Sennheiser HD 660S2 for

A wired connection

Built from verified specifications that differ. Not a rating or a recommendation.

See the 5 verified differences

THE CONTENDER

Sennheiser HD 660S2

700240 · black with bronze accents · 300 ohm · 1.8 m balanced and unbalanced cables

Full product profile Official image

Exact model & source notes

The HD 660S2 is an open-back, over-ear headphone with a 38 mm dynamic driver rated 8–41,500 Hz (−10 dB) at 300 ohms. Sennheiser revised its acoustics for stronger sub-bass, and it ships with 1.8 m 6.35 mm unbalanced and 4.4 mm balanced cables plus a 3.5 mm adapter.

Specifications checked 11 Sept 2026.

Amazon links open search results. Check the exact variant, current price and availability with the retailer.

Manufacturer specifications

OnePlus Buds 4 UK & US retailers

UK & US price history: no verified listing yet

Sennheiser HD 660S2 UK & US retailers

UK & US price history: no verified listing yet

Search links open retailer results, not a matched listing; eBay listings are checked daily. As an Amazon Associate I earn from qualifying purchases. As an eBay Partner, we may be compensated if you make a purchase.

THE DIFFERENCES, MADE VISIBLE

Visual facts

Differences first. Select a topic for its graphic, sources and conditions.

How to read this comparison

Manufacturer facts for the exact models shown. Not a quality rating or a test result.
“Different” means the known values differ, not that one is better.
Missing or conflicting evidence is marked and never counts as a difference. Source chips hold each fact’s sources and conditions.

FEATURES SIDE BY SIDE6 topics

Yes and No describe the listed feature. Missing evidence stays unverified.

SELECTED TOPIC

01 / 06

Open-back design

Open-back earcups are not sealed. Start here if your listening space is quiet; this construction is not a sound-quality rating.

OnePlus Buds 4Not verified

Sennheiser HD 660S2Yes

Open-back. Manufacturer specification

Source 1

Choose your must-haves

Start with your listening environment. Open and closed earcups suit different surroundings. A closed back is not the same as active noise cancellation. Check the exact cable and headphone output. We do not turn impedance, driver size or unpaired lab results into a sound-quality score.

WHAT CHANGES BETWEEN THEM?

Key differences

Full specifications ↓

5 verified differences, most decision-relevant first. Missing information stays separate.

Wired / wireless connections

OnePlus Buds 4Bluetooth 5.4 with Steady Connect; LHDC 5.0, AAC and SBC codecs; dual-device connection

Sennheiser HD 660S2Wired analogue stereo; 1.8 m cables with 6.35 mm unbalanced and 4.4 mm balanced plugs; included 3.5 mm adapter

Sources

OnePlus Buds 4

Manufacturer specification · Google Fast Pair is listed without an exact supported-phone range on these Buds 4 pages. Steady Connect is restricted to select OnePlus phones with OxygenOS 15.0.0 or later. The declared Bluetooth range is 10 m; actual conditions and interference vary. Case charging is separate and does not establish cable audio.

OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (UK) — OnePlus Buds 4 overview

Sennheiser HD 660S2

Manufacturer specification

Sennheiser HD 660S2 — exact model specifications Sennheiser HD 660S2 — operating guide and specifications

Check the exact configuration and source conditions for your use.

Drivers

OnePlus Buds 4Dual drivers: 11 mm woofer + 6 mm tweeter

Sennheiser HD 660S238 mm open dynamic transducer; aluminium voice coil and vented magnet system

Sources

OnePlus Buds 4

Manufacturer specification · Woofer: 30-layer ceramic-metal diaphragm; tweeter: flat diaphragm.

OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (UK) — OnePlus Buds 4 overview

Sennheiser HD 660S2

Manufacturer specification · Sennheiser lists 38 mm as the transducer size.

Sennheiser HD 660S2 — exact model specifications

Check whether the diameter describes the complete transducer or only its diaphragm. Different labels and driver sizes do not establish better sound.

Wearing style

OnePlus Buds 4In-ear, true wireless (ear tips in S, M and L)

Sennheiser HD 660S2Over-ear (circumaural), open-back dynamic headphones

Sources

OnePlus Buds 4

Manufacturer specification · Two earbuds (one pair) with a charging case; the box lists ear tips in S, M and L pairs, with M pre-installed. OnePlus does not state the ear tip material.

OnePlus (UK) — OnePlus Buds 4 Specs

Sennheiser HD 660S2

Manufacturer specification

Sennheiser HD 660S2 — operating guide and specifications

Check the exact configuration and source conditions for your use.

Frequency response

OnePlus Buds 415 Hz to 40 kHz

Sennheiser HD 660S28–41,500 Hz (−10 dB)

Sources

OnePlus Buds 4

Manufacturer specification

OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (US) — OnePlus Buds 4 Specs

Sennheiser HD 660S2

Manufacturer specification

Sennheiser HD 660S2 — operating guide and specifications

Range endpoints need their stated threshold. They do not describe response flatness or prove better bass, detail or sound quality.

Manufacturer sensitivity and reference

OnePlus Buds 4118 ± 1.3 dB at 1 mW

Sennheiser HD 660S2104 dB SPL at 1 kHz, 1 V rms

Sources

OnePlus Buds 4

Manufacturer specification · Buds 4 names a 1 mW input but no frequency or test fixture. Buds Pro 3 names 1 kHz and the literal “Input: -10 dB IEC711” notation, without identifying that input in volts or milliwatts. These do not provide sensitivity on the same basis; do not convert or rank them.

OnePlus (UK) — OnePlus Buds 4 Specs

Sennheiser HD 660S2

Manufacturer specification · Rated at 1 kHz with 1 V rms; not directly comparable with dB/mW ratings.

Sennheiser HD 660S2 — operating guide and specifications

Keep the frequency and voltage or power reference attached. Sensitivity describes output for an input, not sound quality; dB/V and dB/mW are different measures.

Missing or non-comparable evidence (43)

Acoustic design

OnePlus Buds 4Not verified

Sennheiser HD 660S2Open-back

Sources

OnePlus Buds 4

No source recorded for this side.

Sennheiser HD 660S2

Manufacturer specification

Sennheiser HD 660S2 — operating guide and specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Active noise cancellation

OnePlus Buds 4Yes

Sennheiser HD 660S2Not verified

Sources

OnePlus Buds 4

Manufacturer specification · Real-time adaptive ANC advertised up to 55 dB and up to 5,500 Hz; modes: ANC on, Adaptive, Transparency and ANC off. The overview advertises 800 adjustments per second and a 200% voice-cancellation improvement (3×) against OnePlus Buds 3, based on OnePlus Test Laboratory results. These claims do not compare against Buds Pro 3, and no matched attenuation test is supplied. TÜV High Performance Noise Cancellation is a manufacturer-listed claim, not independently re-certified here.

OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (UK) — OnePlus Buds 4 overview

Sennheiser HD 660S2

The reviewed exact sources do not explicitly establish active noise cancellation absence. Preserve separately sourced acoustic design and passive attenuation; they cannot turn omitted ANC into a false capability. · Manufacturer specification

Sennheiser HD 660S2 — operating guide and specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Microphone

In Visual facts

OnePlus Buds 4Yes

Sennheiser HD 660S2Not verified

Sources

OnePlus Buds 4

Manufacturer specification · Three microphones per earbud with 3-mic AI call noise cancellation.

OnePlus (UK) — OnePlus Buds 4 Specs

Sennheiser HD 660S2

The reviewed exact sources do not explicitly establish microphone absence. Omission from a package or technical inventory, a stereo audio connector, and a without-remote statement do not establish microphone=false. · Manufacturer specification

Sennheiser HD 660S2 — operating guide and specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Battery life

OnePlus Buds 4Earbuds: 6 hours with ANC on, 11 hours with ANC off (AAC). With the case: 24 hours with ANC on, 45 hours with ANC off (AAC). Using LHDC: 5.5 / 22 hours with ANC on and 9 / 37 hours with ANC off.

Sennheiser HD 660S2Not verified

Sources

OnePlus Buds 4

Manufacturer specification · OnePlus test figures at 50% volume with the stated codec. Fast charge: 10 minutes gives 3.5 hours (earbuds) or 11 hours (earbuds + case) with ANC off, AAC.

OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (US) — OnePlus Buds 4 Specs

Sennheiser HD 660S2

The reviewed exact sources do not explicitly establish battery life or that no battery is required for operation. A wired/dynamic audio path, omitted charger or Battery included N is not an explicit operating-power requirement. · Manufacturer specification

Sennheiser HD 660S2 — operating guide and specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Listed driver impedances

OnePlus Buds 418 Ω ± 15%; 10 Ω ± 15%

Sennheiser HD 660S2300 ohm

Sources

OnePlus Buds 4

Manufacturer specification · The table gives two values but does not explicitly assign them to a named driver or a headphone input/load condition. Do not invent a woofer/tweeter assignment or amplifier compatibility result.

OnePlus (UK) — OnePlus Buds 4 Specs

Sennheiser HD 660S2

Manufacturer specification · Nominal impedance; check that your amplifier or audio source can drive this load.

Sennheiser HD 660S2 — operating guide and specifications

The recorded units or formats differ. These values are not ranked.

Published acoustic changes

OnePlus Buds 4Not verified

Sennheiser HD 660S2Revised 300-ohm coil, more compliant surround, 70 Hz resonance and revised transducer airflow

Sources

OnePlus Buds 4

No source recorded for this side.

Sennheiser HD 660S2

Manufacturer specification · Sennheiser describes these changes as the S2 revision of the HD 660S.

Sennheiser HD 660S2 — exact model specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

AI Translation

OnePlus Buds 4Yes

Sennheiser HD 660S2Not verified

Sources

OnePlus Buds 4

Manufacturer specification · Three earbud taps activate AI Translation on the OnePlus phone; available on select OnePlus devices with OxygenOS 15.0.1 and above.

OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (UK) — OnePlus Buds 4 overview

Sennheiser HD 660S2

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Companion app

OnePlus Buds 4Compatible with the HeyMelody app. Sound features: Sound Master EQ (Balanced, Serenade and Bass Mode presets, a customisable six-band EQ and BassWave); Golden Sound personal audio profile from an ear scan and listening test

Sennheiser HD 660S2Not verified

Sources

OnePlus Buds 4

Manufacturer specification · Golden Sound (and OnePlus 3D Audio) is set in 'Earbuds Function' on OnePlus phones with Android 12 and above; other users (iOS / Android 7.0 and above) need the HeyMelody app. The specification page also lists OTA updates.

OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (UK) — OnePlus Buds 4 overview

Sennheiser HD 660S2

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Battery capacity

OnePlus Buds 4Earbuds 62 mAh; charging case 530 mAh

Sennheiser HD 660S2Not verified

Sources

OnePlus Buds 4

Manufacturer specification

OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (US) — OnePlus Buds 4 Specs

Sennheiser HD 660S2

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Playback with case, AAC, ANC on

OnePlus Buds 424 h

Sennheiser HD 660S2Not verified

Sources

OnePlus Buds 4

Manufacturer specification · Music playback with the case, AAC, ANC on and 50% volume. OnePlus Test Laboratory claim; actual performance varies.

OnePlus (UK) — OnePlus Buds 4 Specs

Sennheiser HD 660S2

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Included and optional cables

OnePlus Buds 4Not verified

Sennheiser HD 660S2Detachable 1.8 m unbalanced and 4.4 mm balanced cables included; XLR-4 cable optional

Sources

OnePlus Buds 4

No source recorded for this side.

Sennheiser HD 660S2

Manufacturer specification · Optional cables are sold separately; balanced cables need a balanced headphone output.

Sennheiser HD 660S2 — exact model specifications Sennheiser HD 660S2 — operating guide and specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Included cable length

OnePlus Buds 4Not verified

Sennheiser HD 660S21.8 m

Sources

OnePlus Buds 4

No source recorded for this side.

Sennheiser HD 660S2

Manufacturer specification · Length of the supplied cable.

Sennheiser HD 660S2 — operating guide and specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

UK published case weight

OnePlus Buds 439.57 g

Sennheiser HD 660S2Not verified

Sources

OnePlus Buds 4

Manufacturer specification · UK: 39.57 ± 1 g; US: 39.97 ± 1 g. The selected SKU is UK; the source discrepancy is unexplained. Do not average the figures, assert physical equivalence across regions or interpret case weight as the earbuds-and-case total.

OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (US) — OnePlus Buds 4 Specs

Sennheiser HD 660S2

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Charge time

OnePlus Buds 4Earbuds about 50 minutes; earbuds + case about 80 minutes

Sennheiser HD 660S2Not verified

Sources

OnePlus Buds 4

Manufacturer specification

OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (US) — OnePlus Buds 4 Specs

Sennheiser HD 660S2

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Case charging connector

OnePlus Buds 4USB Type-C

Sennheiser HD 660S2Not verified

Sources

OnePlus Buds 4

Manufacturer specification · The source describes charging, not USB audio or data operation. Compatible charger power and a cable-audio mode are not established.

OnePlus (UK) — OnePlus Buds 4 Specs

Sennheiser HD 660S2

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Bluetooth codecs

OnePlus Buds 4LHDC 5.0, AAC, SBC

Sennheiser HD 660S2Not verified

Sources

OnePlus Buds 4

Manufacturer specification · LHDC 5.0 Hi-Res Audio up to 1 Mbps, 24 bit, 192 kHz. Hi-Res Audio is supported on Android devices with LHDC 5.0 (OnePlus phones with Android 12 and above via 'Earbuds Function'; other Android 7.0 and above via the HeyMelody app) and is not supported on iOS devices.

OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (UK) — OnePlus Buds 4 overview

Sennheiser HD 660S2

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Supplied plug configuration

OnePlus Buds 4Not verified

Sennheiser HD 660S26.35 mm unbalanced cable; 4.4 mm balanced cable; 6.35 mm-to-3.5 mm adapter

Sources

OnePlus Buds 4

No source recorded for this side.

Sennheiser HD 660S2

Manufacturer specification · The 4.4 mm balanced cable needs a balanced headphone output; an XLR-4 cable is optional.

Sennheiser HD 660S2 — exact model specifications Sennheiser HD 660S2 — operating guide and specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Rated contact pressure

OnePlus Buds 4Not verified

Sennheiser HD 660S2Approximately 6.0 N ±1.0 N

Sources

OnePlus Buds 4

No source recorded for this side.

Sennheiser HD 660S2

Manufacturer specification · Nominal clamping force; individual fit and comfort can differ.

Sennheiser HD 660S2 — operating guide and specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Earbud controls

OnePlus Buds 4Touch controls on the stem: slide up or down for volume; long touch and hold to switch between Noise Cancellation and Transparency modes; single tap to play or pause; double tap for the next song; triple tap for the previous song

Sennheiser HD 660S2Not verified

Sources

OnePlus Buds 4

Manufacturer specification · Single tap must be manually activated in the phone Settings (OnePlus phones) or the HeyMelody app (other Android and iOS). OnePlus also lists a tap for the phone's built-in voice assistant (activated manually in the same way), Double-Tap for Camera Control and three taps for AI Translation on select OnePlus devices.

OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (UK) — OnePlus Buds 4 overview

Sennheiser HD 660S2

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

DAC

OnePlus Buds 4Dual DACs: a dedicated DAC for each driver (11 mm woofer and 6 mm tweeter)

Sennheiser HD 660S2Not verified

Sources

OnePlus Buds 4

Manufacturer specification

OnePlus (UK) — OnePlus Buds 4 overview

Sennheiser HD 660S2

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Rated total harmonic distortion

OnePlus Buds 4Not verified

Sennheiser HD 660S2≤0.04% at 1 kHz, 100 dB SPL

Sources

OnePlus Buds 4

No source recorded for this side.

Sennheiser HD 660S2

Manufacturer specification · Rated at 1 kHz and 100 dB SPL; other models use different test levels, so compare with care.

Sennheiser HD 660S2 — exact model specifications Sennheiser HD 660S2 — operating guide and specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Ear pads

OnePlus Buds 4Not verified

Sennheiser HD 660S2Velour ear pads; replaceable

Sources

OnePlus Buds 4

No source recorded for this side.

Sennheiser HD 660S2

Manufacturer specification · Replacement procedure shown in the manual.

Sennheiser HD 660S2 — exact model specifications Sennheiser HD 660S2 — operating guide and specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Find My Earbuds

OnePlus Buds 4Yes

Sennheiser HD 660S2Not verified

Sources

OnePlus Buds 4

Manufacturer specification · Listed by name only; OnePlus does not describe how it works on these pages.

OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (UK) — OnePlus Buds 4 overview

Sennheiser HD 660S2

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Frequency equalisation

OnePlus Buds 4Not verified

Sennheiser HD 660S2Diffuse-field equalised

Sources

OnePlus Buds 4

No source recorded for this side.

Sennheiser HD 660S2

Manufacturer specification

Sennheiser HD 660S2 — operating guide and specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Spatial audio head tracking

OnePlus Buds 4Not verified

Sennheiser HD 660S2Not verified

Sources

OnePlus Buds 4

No explicit head-tracking presence or absence is established in the complete reviewed Buds4 pages. OnePlus3DAudio alone does not prove head tracking. · Manufacturer specification

OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (UK) — OnePlus Buds 4 overview

Sennheiser HD 660S2

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Rated long-term input power

OnePlus Buds 4Not verified

Sennheiser HD 660S2Maximum 500 mW under EN 60-268-7

Sources

OnePlus Buds 4

No source recorded for this side.

Sennheiser HD 660S2

Manufacturer specification · Rated to EN 60-268-7; the maximum input the headphones can handle, not the amplifier power they need.

Sennheiser HD 660S2 — operating guide and specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Low-latency mode

OnePlus Buds 447 ms low latency

Sennheiser HD 660S2Not verified

Sources

OnePlus Buds 4

Manufacturer specification · OnePlus Test Laboratory figure; enabled automatically on OnePlus phones, manual operation in the HeyMelody app on other brands.

OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (UK) — OnePlus Buds 4 overview

Sennheiser HD 660S2

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Static magnetic field at the surface

OnePlus Buds 4Not verified

Sennheiser HD 660S24.5 mT

Sources

OnePlus Buds 4

No source recorded for this side.

Sennheiser HD 660S2

Manufacturer specification · Static magnetic field at the headphone surface.

Sennheiser HD 660S2 — exact model specifications Sennheiser HD 660S2 — operating guide and specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Manufacturer microphone sensitivity

OnePlus Buds 4-38 ± 1 dB

Sennheiser HD 660S2Not verified

Sources

OnePlus Buds 4

Manufacturer specification · Buds4 gives no dBV/Pa reference; Pro3 explicitly gives dBV/Pa. These different bases cannot establish a microphone-performance difference.

OnePlus (UK) — OnePlus Buds 4 Specs

Sennheiser HD 660S2

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Multipoint (dual-device) connection

OnePlus Buds 4Yes

Sennheiser HD 660S2Not verified

Sources

OnePlus Buds 4

Manufacturer specification

OnePlus (UK) — OnePlus Buds 4 Specs

Sennheiser HD 660S2

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Operating temperature

OnePlus Buds 4Not verified

Sennheiser HD 660S2−10 °C to +55 °C

Sources

OnePlus Buds 4

No source recorded for this side.

Sennheiser HD 660S2

Manufacturer specification

Sennheiser HD 660S2 — operating guide and specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Manufacturer rated power

OnePlus Buds 410 mW

Sennheiser HD 660S2Not verified

Sources

OnePlus Buds 4

Manufacturer specification · The Audio table does not explicitly assign this rating to an individual driver or define a continuous/peak basis. No power-handling or sound-quality ranking is established.

OnePlus (UK) — OnePlus Buds 4 Specs

Sennheiser HD 660S2

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Replaceable parts

OnePlus Buds 4Not verified

Sennheiser HD 660S2Detachable cable and replaceable ear pads

Sources

OnePlus Buds 4

No source recorded for this side.

Sennheiser HD 660S2

Manufacturer specification · Replacement procedures are in the manual; spare-part availability varies.

Sennheiser HD 660S2 — operating guide and specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

UK published earbuds and case total weight

OnePlus Buds 449.02 g

Sennheiser HD 660S2Not verified

Sources

OnePlus Buds 4

Manufacturer specification · UK: 49.02 ± 1 g; US: 49.42 ± 1 g. These are published total values, not newly calculated sums. The regional difference remains unexplained.

OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (US) — OnePlus Buds 4 Specs

Sennheiser HD 660S2

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Unreferenced advertised sound pressure

OnePlus Buds 496.5 dB

Sennheiser HD 660S2Not verified

Sources

OnePlus Buds 4

Manufacturer specification · No frequency, input reference, weighting or explicit maximum label is supplied in this row. Do not reinterpret as maximum SPL or sensitivity.

OnePlus (UK) — OnePlus Buds 4 Specs

Sennheiser HD 660S2

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Spatial audio

OnePlus Buds 4Spatial audio rendering

Sennheiser HD 660S2Not verified

Sources

OnePlus Buds 4

Manufacturer specification · Marketed as OnePlus 3D Audio. Set through Earbuds Function on OnePlus phones running Android 12 or later, or through HeyMelody for other iOS/Android 7 or later users. These pages do not explicitly establish head tracking.

OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (UK) — OnePlus Buds 4 overview

Sennheiser HD 660S2

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Manufacturer sub-bass claim

OnePlus Buds 4Not verified

Sennheiser HD 660S2Double the sound pressure at the lowest frequencies

Sources

OnePlus Buds 4

No source recorded for this side.

Sennheiser HD 660S2

Manufacturer specification · Sennheiser does not give the frequency range or comparison model for this claim.

Sennheiser HD 660S2 — exact model specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Bone-conduction voice pickup sensor

OnePlus Buds 4Not verified

Sennheiser HD 660S2Not verified

Sources

OnePlus Buds 4

The complete reviewed Buds4 pages describe three microphones per side but do not establish VPU presence or absence. · Manufacturer specification

OnePlus (UK) — OnePlus Buds 4 Specs

Sennheiser HD 660S2

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Dust, sweat and water resistance

OnePlus Buds 4IP55 (earbuds only; the charging case is not rated)

Sennheiser HD 660S2Not verified

Sources

OnePlus Buds 4

Manufacturer specification · OnePlus: the earbuds feature IP55 water and dust resistance, however the charging case does not. Water and dust resistance may diminish with device ageing; liquid and dust damage are not covered under the warranty.

OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (UK) — OnePlus Buds 4 overview

Sennheiser HD 660S2

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Weight per earbud

OnePlus Buds 44.73 g

Sennheiser HD 660S2Not verified

Sources

OnePlus Buds 4

Manufacturer specification · Each earbud, stated as 4.73 ± 0.2 g on both UK and US pages. The UK page gives the charging case as 39.57 ± 1 g (total 49.02 ± 1 g); the US page gives 39.97 ± 1 g (total 49.42 ± 1 g).

OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (US) — OnePlus Buds 4 Specs

Sennheiser HD 660S2

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Wireless case charging

OnePlus Buds 4Not verified

Sennheiser HD 660S2Not verified

Sources

OnePlus Buds 4

The complete reviewed exact pages list USB-C charging but do not explicitly establish wireless-charging presence or absence. Omission does not mean false. · Manufacturer specification

OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (UK) — OnePlus Buds 4 overview

Sennheiser HD 660S2

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Dimensions

OnePlus Buds 4Each earbud: 31 x 20.6 x 24.2 mm; charging case: 65.4 x 52.4 x 25.3 mm

Sennheiser HD 660S2Not verified

Sources

OnePlus Buds 4

Manufacturer specification

OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (US) — OnePlus Buds 4 Specs

Sennheiser HD 660S2

No source recorded for this side.

Evidence is missing or conflicting on at least one side. This is not a verified difference.

Weight

OnePlus Buds 4Not verified

Sennheiser HD 660S2260 g

Sources

OnePlus Buds 4

No source recorded for this side.

Sennheiser HD 660S2

Manufacturer specification · Approximate, without the cable.

Sennheiser HD 660S2 — operating guide and specifications

Evidence is missing or conflicting on at least one side. This is not a verified difference.

0 shared fields have the same recorded value.

YOUR HEADPHONES. YOUR RULES.

Check against your must-haves

Feature matching for the features you select. It doesn’t rate sound or comfort.

Start with your listening setup.

Choose a starting point, then fine-tune your must-haves.

FINE-TUNE THE DETAILS

Your essentials.

These shortcuts select the features shown above. Check the fit against your own equipment and listening space.

A feature match describes the selected requirements. It doesn’t rate sound or comfort.

Open-back designFor a quiet listening spaceClosed-back designAn enclosed outer earcupDetachable cableUnplug the cable at the headphonesBuilt-in microphoneFor calls and voice chatActive noise cancellationNot the same as a closed back

YOUR CHOICE

OnePlus Buds 4

Select a feature to check your fit.

YOUR CHOICE

Sennheiser HD 660S2

Select a feature to check your fit.

Feature matching, not a sound-quality score. The specification table links to the evidence for each feature.

WHAT EACH CHOICE ASKS OF YOU

What it brings and what to check

OnePlus Buds 4

What it brings

Supports the LHDC 5.0 codec alongside AAC and SBC, plus dual-device connection and Google Fast Pair.
Manufacturer source
Adaptive ANC is rated up to 55 dB, with separate Adaptive and Transparency modes, and each earbud has three microphones for calls.
Manufacturer source

What to check

The specification page lists USB-C case charging; wireless-charging support is not established by the reviewed exact sources.
Manufacturer source
Battery drops when using LHDC: 5.5 hours per charge with ANC on, versus 6 hours with AAC. OnePlus's UK and US pages also give slightly different case weights (39.57 g and 39.97 g).
Manufacturer source Manufacturer source

Sennheiser HD 660S2

What it brings

Both a 4.4 mm balanced and a 6.35 mm unbalanced cable are included with a 3.5 mm adapter, and the velour ear pads are replaceable.
Manufacturer source Manufacturer source
A revised 300-ohm voice coil, more compliant surround and vented magnet system are designed for more sub-bass, and sensitivity is rated at 104 dB SPL at 1 V.
Manufacturer source Manufacturer source

What to check

At 300 ohms with a rated 104 dB SPL at 1 kHz / 1 V rms, check that your amplifier or audio source can drive the headphones properly.
Manufacturer source Manufacturer source
The open-back design leaks sound and lets outside noise in, and the supplied cables are 1.8 m long. An XLR-4 cable is sold separately.
Manufacturer source Manufacturer source

COMPARE THE DETAILS

Full specifications

How we verify

Differences only

48 of 48 specifications Sources in each row

Source-backed specifications for OnePlus Buds 4 and Sennheiser HD 660S2
Specification	OnePlus Buds 4	Sennheiser HD 660S2

Wearing styleDifferent Sources OnePlus Buds 4 Manufacturer specification · Two earbuds (one pair) with a charging case; the box lists ear tips in S, M and L pairs, with M pre-installed. OnePlus does not state the ear tip material. OnePlus (UK) — OnePlus Buds 4 Specs Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications	In-ear, true wireless (ear tips in S, M and L)	Over-ear (circumaural), open-back dynamic headphones
Weight per earbud Sources OnePlus Buds 4 Manufacturer specification · Each earbud, stated as 4.73 ± 0.2 g on both UK and US pages. The UK page gives the charging case as 39.57 ± 1 g (total 49.02 ± 1 g); the US page gives 39.97 ± 1 g (total 49.42 ± 1 g). OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (US) — OnePlus Buds 4 Specs Sennheiser HD 660S2 No source recorded.	4.73 g	Not provided
Dimensions Sources OnePlus Buds 4 Manufacturer specification OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (US) — OnePlus Buds 4 Specs Sennheiser HD 660S2 No source recorded.	Each earbud: 31 x 20.6 x 24.2 mm; charging case: 65.4 x 52.4 x 25.3 mm	Not provided
Dust, sweat and water resistance Sources OnePlus Buds 4 Manufacturer specification · OnePlus: the earbuds feature IP55 water and dust resistance, however the charging case does not. Water and dust resistance may diminish with device ageing; liquid and dust damage are not covered under the warranty. OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (UK) — OnePlus Buds 4 overview Sennheiser HD 660S2 No source recorded.	IP55 (earbuds only; the charging case is not rated)	Not provided
UK published case weight Sources OnePlus Buds 4 Manufacturer specification · UK: 39.57 ± 1 g; US: 39.97 ± 1 g. The selected SKU is UK; the source discrepancy is unexplained. Do not average the figures, assert physical equivalence across regions or interpret case weight as the earbuds-and-case total. OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (US) — OnePlus Buds 4 Specs Sennheiser HD 660S2 No source recorded.	39.57 g	Not provided
UK published earbuds and case total weight Sources OnePlus Buds 4 Manufacturer specification · UK: 49.02 ± 1 g; US: 49.42 ± 1 g. These are published total values, not newly calculated sums. The regional difference remains unexplained. OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (US) — OnePlus Buds 4 Specs Sennheiser HD 660S2 No source recorded.	49.02 g	Not provided
Weight Sources OnePlus Buds 4 No source recorded. Sennheiser HD 660S2 Manufacturer specification · Approximate, without the cable. Sennheiser HD 660S2 — operating guide and specifications	Not provided	260 g
Acoustic design Sources OnePlus Buds 4 No source recorded. Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications	Not provided	Open-back
Replaceable parts Sources OnePlus Buds 4 No source recorded. Sennheiser HD 660S2 Manufacturer specification · Replacement procedures are in the manual; spare-part availability varies. Sennheiser HD 660S2 — operating guide and specifications	Not provided	Detachable cable and replaceable ear pads
Ear pads Sources OnePlus Buds 4 No source recorded. Sennheiser HD 660S2 Manufacturer specification · Replacement procedure shown in the manual. Sennheiser HD 660S2 — exact model specifications Sennheiser HD 660S2 — operating guide and specifications	Not provided	Velour ear pads; replaceable
Rated contact pressure Sources OnePlus Buds 4 No source recorded. Sennheiser HD 660S2 Manufacturer specification · Nominal clamping force; individual fit and comfort can differ. Sennheiser HD 660S2 — operating guide and specifications	Not provided	Approximately 6.0 N ±1.0 N

Wired / wireless connectionsDifferent Sources OnePlus Buds 4 Manufacturer specification · Google Fast Pair is listed without an exact supported-phone range on these Buds 4 pages. Steady Connect is restricted to select OnePlus phones with OxygenOS 15.0.0 or later. The declared Bluetooth range is 10 m; actual conditions and interference vary. Case charging is separate and does not establish cable audio. OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (UK) — OnePlus Buds 4 overview Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — exact model specifications Sennheiser HD 660S2 — operating guide and specifications	Bluetooth 5.4 with Steady Connect; LHDC 5.0, AAC and SBC codecs; dual-device connection	Wired analogue stereo; 1.8 m cables with 6.35 mm unbalanced and 4.4 mm balanced plugs; included 3.5 mm adapter
Battery life Sources OnePlus Buds 4 Manufacturer specification · OnePlus test figures at 50% volume with the stated codec. Fast charge: 10 minutes gives 3.5 hours (earbuds) or 11 hours (earbuds + case) with ANC off, AAC. OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (US) — OnePlus Buds 4 Specs Sennheiser HD 660S2 The reviewed exact sources do not explicitly establish battery life or that no battery is required for operation. A wired/dynamic audio path, omitted charger or Battery included N is not an explicit operating-power requirement. · Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications	Earbuds: 6 hours with ANC on, 11 hours with ANC off (AAC). With the case: 24 hours with ANC on, 45 hours with ANC off (AAC). Using LHDC: 5.5 / 22 hours with ANC on and 9 / 37 hours with ANC off.	Not listed by the manufacturer
Battery capacity Sources OnePlus Buds 4 Manufacturer specification OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (US) — OnePlus Buds 4 Specs Sennheiser HD 660S2 No source recorded.	Earbuds 62 mAh; charging case 530 mAh	Not provided
Charge time Sources OnePlus Buds 4 Manufacturer specification OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (US) — OnePlus Buds 4 Specs Sennheiser HD 660S2 No source recorded.	Earbuds about 50 minutes; earbuds + case about 80 minutes	Not provided
Low-latency mode Sources OnePlus Buds 4 Manufacturer specification · OnePlus Test Laboratory figure; enabled automatically on OnePlus phones, manual operation in the HeyMelody app on other brands. OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (UK) — OnePlus Buds 4 overview Sennheiser HD 660S2 No source recorded.	47 ms low latency	Not provided
Bluetooth codecs Sources OnePlus Buds 4 Manufacturer specification · LHDC 5.0 Hi-Res Audio up to 1 Mbps, 24 bit, 192 kHz. Hi-Res Audio is supported on Android devices with LHDC 5.0 (OnePlus phones with Android 12 and above via 'Earbuds Function'; other Android 7.0 and above via the HeyMelody app) and is not supported on iOS devices. OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (UK) — OnePlus Buds 4 overview Sennheiser HD 660S2 No source recorded.	LHDC 5.0, AAC, SBC	Not provided
Multipoint (dual-device) connection Sources OnePlus Buds 4 Manufacturer specification OnePlus (UK) — OnePlus Buds 4 Specs Sennheiser HD 660S2 No source recorded.	Yes	Not provided
Case charging connector Sources OnePlus Buds 4 Manufacturer specification · The source describes charging, not USB audio or data operation. Compatible charger power and a cable-audio mode are not established. OnePlus (UK) — OnePlus Buds 4 Specs Sennheiser HD 660S2 No source recorded.	USB Type-C	Not provided
Playback with case, AAC, ANC on Sources OnePlus Buds 4 Manufacturer specification · Music playback with the case, AAC, ANC on and 50% volume. OnePlus Test Laboratory claim; actual performance varies. OnePlus (UK) — OnePlus Buds 4 Specs Sennheiser HD 660S2 No source recorded.	24 h	Not provided
Included cable length Sources OnePlus Buds 4 No source recorded. Sennheiser HD 660S2 Manufacturer specification · Length of the supplied cable. Sennheiser HD 660S2 — operating guide and specifications	Not provided	1.8 m
Supplied plug configuration Sources OnePlus Buds 4 No source recorded. Sennheiser HD 660S2 Manufacturer specification · The 4.4 mm balanced cable needs a balanced headphone output; an XLR-4 cable is optional. Sennheiser HD 660S2 — exact model specifications Sennheiser HD 660S2 — operating guide and specifications	Not provided	6.35 mm unbalanced cable; 4.4 mm balanced cable; 6.35 mm-to-3.5 mm adapter
Included and optional cables Sources OnePlus Buds 4 No source recorded. Sennheiser HD 660S2 Manufacturer specification · Optional cables are sold separately; balanced cables need a balanced headphone output. Sennheiser HD 660S2 — exact model specifications Sennheiser HD 660S2 — operating guide and specifications	Not provided	Detachable 1.8 m unbalanced and 4.4 mm balanced cables included; XLR-4 cable optional

DriversDifferent Sources OnePlus Buds 4 Manufacturer specification · Woofer: 30-layer ceramic-metal diaphragm; tweeter: flat diaphragm. OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (UK) — OnePlus Buds 4 overview Sennheiser HD 660S2 Manufacturer specification · Sennheiser lists 38 mm as the transducer size. Sennheiser HD 660S2 — exact model specifications	Dual drivers: 11 mm woofer + 6 mm tweeter	38 mm open dynamic transducer; aluminium voice coil and vented magnet system
Frequency responseDifferent Sources OnePlus Buds 4 Manufacturer specification OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (US) — OnePlus Buds 4 Specs Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications	15 Hz to 40 kHz	8–41,500 Hz (−10 dB)
DAC Sources OnePlus Buds 4 Manufacturer specification OnePlus (UK) — OnePlus Buds 4 overview Sennheiser HD 660S2 No source recorded.	Dual DACs: a dedicated DAC for each driver (11 mm woofer and 6 mm tweeter)	Not provided
Spatial audio Sources OnePlus Buds 4 Manufacturer specification · Marketed as OnePlus 3D Audio. Set through Earbuds Function on OnePlus phones running Android 12 or later, or through HeyMelody for other iOS/Android 7 or later users. These pages do not explicitly establish head tracking. OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (UK) — OnePlus Buds 4 overview Sennheiser HD 660S2 No source recorded.	Spatial audio rendering	Not provided
Listed driver impedances Sources OnePlus Buds 4 Manufacturer specification · The table gives two values but does not explicitly assign them to a named driver or a headphone input/load condition. Do not invent a woofer/tweeter assignment or amplifier compatibility result. OnePlus (UK) — OnePlus Buds 4 Specs Sennheiser HD 660S2 Manufacturer specification · Nominal impedance; check that your amplifier or audio source can drive this load. Sennheiser HD 660S2 — operating guide and specifications	18 Ω ± 15%; 10 Ω ± 15%	300 ohm
Manufacturer sensitivity and referenceDifferent Sources OnePlus Buds 4 Manufacturer specification · Buds 4 names a 1 mW input but no frequency or test fixture. Buds Pro 3 names 1 kHz and the literal “Input: -10 dB IEC711” notation, without identifying that input in volts or milliwatts. These do not provide sensitivity on the same basis; do not convert or rank them. OnePlus (UK) — OnePlus Buds 4 Specs Sennheiser HD 660S2 Manufacturer specification · Rated at 1 kHz with 1 V rms; not directly comparable with dB/mW ratings. Sennheiser HD 660S2 — operating guide and specifications	118 ± 1.3 dB at 1 mW	104 dB SPL at 1 kHz, 1 V rms
Unreferenced advertised sound pressure Sources OnePlus Buds 4 Manufacturer specification · No frequency, input reference, weighting or explicit maximum label is supplied in this row. Do not reinterpret as maximum SPL or sensitivity. OnePlus (UK) — OnePlus Buds 4 Specs Sennheiser HD 660S2 No source recorded.	96.5 dB	Not provided
Manufacturer rated power Sources OnePlus Buds 4 Manufacturer specification · The Audio table does not explicitly assign this rating to an individual driver or define a continuous/peak basis. No power-handling or sound-quality ranking is established. OnePlus (UK) — OnePlus Buds 4 Specs Sennheiser HD 660S2 No source recorded.	10 mW	Not provided
Frequency equalisation Sources OnePlus Buds 4 No source recorded. Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications	Not provided	Diffuse-field equalised
Rated total harmonic distortion Sources OnePlus Buds 4 No source recorded. Sennheiser HD 660S2 Manufacturer specification · Rated at 1 kHz and 100 dB SPL; other models use different test levels, so compare with care. Sennheiser HD 660S2 — exact model specifications Sennheiser HD 660S2 — operating guide and specifications	Not provided	≤0.04% at 1 kHz, 100 dB SPL
Rated long-term input power Sources OnePlus Buds 4 No source recorded. Sennheiser HD 660S2 Manufacturer specification · Rated to EN 60-268-7; the maximum input the headphones can handle, not the amplifier power they need. Sennheiser HD 660S2 — operating guide and specifications	Not provided	Maximum 500 mW under EN 60-268-7
Published acoustic changes Sources OnePlus Buds 4 No source recorded. Sennheiser HD 660S2 Manufacturer specification · Sennheiser describes these changes as the S2 revision of the HD 660S. Sennheiser HD 660S2 — exact model specifications	Not provided	Revised 300-ohm coil, more compliant surround, 70 Hz resonance and revised transducer airflow
Manufacturer sub-bass claim Sources OnePlus Buds 4 No source recorded. Sennheiser HD 660S2 Manufacturer specification · Sennheiser does not give the frequency range or comparison model for this claim. Sennheiser HD 660S2 — exact model specifications	Not provided	Double the sound pressure at the lowest frequencies

Microphone Sources OnePlus Buds 4 Manufacturer specification · Three microphones per earbud with 3-mic AI call noise cancellation. OnePlus (UK) — OnePlus Buds 4 Specs Sennheiser HD 660S2 The reviewed exact sources do not explicitly establish microphone absence. Omission from a package or technical inventory, a stereo audio connector, and a without-remote statement do not establish microphone=false. · Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications	Yes	Not listed by the manufacturer
Active noise cancellation Sources OnePlus Buds 4 Manufacturer specification · Real-time adaptive ANC advertised up to 55 dB and up to 5,500 Hz; modes: ANC on, Adaptive, Transparency and ANC off. The overview advertises 800 adjustments per second and a 200% voice-cancellation improvement (3×) against OnePlus Buds 3, based on OnePlus Test Laboratory results. These claims do not compare against Buds Pro 3, and no matched attenuation test is supplied. TÜV High Performance Noise Cancellation is a manufacturer-listed claim, not independently re-certified here. OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (UK) — OnePlus Buds 4 overview Sennheiser HD 660S2 The reviewed exact sources do not explicitly establish active noise cancellation absence. Preserve separately sourced acoustic design and passive attenuation; they cannot turn omitted ANC into a false capability. · Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications	Yes	Not listed by the manufacturer
Manufacturer microphone sensitivity Sources OnePlus Buds 4 Manufacturer specification · Buds4 gives no dBV/Pa reference; Pro3 explicitly gives dBV/Pa. These different bases cannot establish a microphone-performance difference. OnePlus (UK) — OnePlus Buds 4 Specs Sennheiser HD 660S2 No source recorded.	-38 ± 1 dB	Not provided

Companion app Sources OnePlus Buds 4 Manufacturer specification · Golden Sound (and OnePlus 3D Audio) is set in 'Earbuds Function' on OnePlus phones with Android 12 and above; other users (iOS / Android 7.0 and above) need the HeyMelody app. The specification page also lists OTA updates. OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (UK) — OnePlus Buds 4 overview Sennheiser HD 660S2 No source recorded.	Compatible with the HeyMelody app. Sound features: Sound Master EQ (Balanced, Serenade and Bass Mode presets, a customisable six-band EQ and BassWave); Golden Sound personal audio profile from an ear scan and listening test	Not provided
Find My Earbuds Sources OnePlus Buds 4 Manufacturer specification · Listed by name only; OnePlus does not describe how it works on these pages. OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (UK) — OnePlus Buds 4 overview Sennheiser HD 660S2 No source recorded.	Yes	Not provided
AI Translation Sources OnePlus Buds 4 Manufacturer specification · Three earbud taps activate AI Translation on the OnePlus phone; available on select OnePlus devices with OxygenOS 15.0.1 and above. OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (UK) — OnePlus Buds 4 overview Sennheiser HD 660S2 No source recorded.	Yes	Not provided
Earbud controls Sources OnePlus Buds 4 Manufacturer specification · Single tap must be manually activated in the phone Settings (OnePlus phones) or the HeyMelody app (other Android and iOS). OnePlus also lists a tap for the phone's built-in voice assistant (activated manually in the same way), Double-Tap for Camera Control and three taps for AI Translation on select OnePlus devices. OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (UK) — OnePlus Buds 4 overview Sennheiser HD 660S2 No source recorded.	Touch controls on the stem: slide up or down for volume; long touch and hold to switch between Noise Cancellation and Transparency modes; single tap to play or pause; double tap for the next song; triple tap for the previous song	Not provided

Static magnetic field at the surface Sources OnePlus Buds 4 No source recorded. Sennheiser HD 660S2 Manufacturer specification · Static magnetic field at the headphone surface. Sennheiser HD 660S2 — exact model specifications Sennheiser HD 660S2 — operating guide and specifications	Not provided	4.5 mT
Operating temperature Sources OnePlus Buds 4 No source recorded. Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications	Not provided	−10 °C to +55 °C

Show unverified (3)Not verified, not provided or conflicting for both products. Kept for completeness; never counted as a difference.

Specifications without verified values for either product
Wireless case charging Sources OnePlus Buds 4 The complete reviewed exact pages list USB-C charging but do not explicitly establish wireless-charging presence or absence. Omission does not mean false. · Manufacturer specification OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (UK) — OnePlus Buds 4 overview Sennheiser HD 660S2 No source recorded.	Not listed by the manufacturer	Not provided
Spatial audio head tracking Sources OnePlus Buds 4 No explicit head-tracking presence or absence is established in the complete reviewed Buds4 pages. OnePlus3DAudio alone does not prove head tracking. · Manufacturer specification OnePlus (UK) — OnePlus Buds 4 Specs OnePlus (UK) — OnePlus Buds 4 overview Sennheiser HD 660S2 No source recorded.	Not listed by the manufacturer	Not provided
Bone-conduction voice pickup sensor Sources OnePlus Buds 4 The complete reviewed Buds4 pages describe three microphones per side but do not establish VPU presence or absence. · Manufacturer specification OnePlus (UK) — OnePlus Buds 4 Specs Sennheiser HD 660S2 No source recorded.	Not listed by the manufacturer	Not provided

First product manufacturer source Second product manufacturer source

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