6974434228757 · White · UK
Nothing Ear (3a) (store SKU 6974434228757 in White, the same on the UK and US stores) are true wireless earbuds with adaptive ANC up to 45 dB, Bluetooth 6.0 with LDAC, a 12 mm driver and on-bud call recording and Audio Snapshot capture.
Specifications checked 26 Sept 2026.
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Manufacturer specificationsChoose the Nothing Ear (3a) for
Choose the Sennheiser HD 660S2 for
700240 · black with bronze accents · 300 ohm · 1.8 m balanced and unbalanced cables
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.
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Differences first. Select a topic for its graphic, sources and conditions.
Yes and No describe the listed feature. Missing evidence stays unverified.
Open-back earcups are not sealed. Start here if your listening space is quiet; this construction is not a sound-quality rating.
Open-back. Manufacturer specification
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.
4 verified differences, most decision-relevant first. Missing information stays separate.
Manufacturer specification · The specification lists only Type-C wired charging (full in 70 minutes); no wireless case charging is listed.
Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsManufacturer specification
Sennheiser HD 660S2 — exact model specificationsSennheiser HD 660S2 — operating guide and specificationsCheck the exact configuration and source conditions for your use.
Manufacturer specification
Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsManufacturer specification · Sennheiser lists 38 mm as the transducer size.
Sennheiser HD 660S2 — exact model specificationsCheck whether the diameter describes the complete transducer or only its diaphragm. Different labels and driver sizes do not establish better sound.
Manufacturer specification · Two earbuds and a charging case; four pairs of ear tips are in the box.
Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsManufacturer specification
Sennheiser HD 660S2 — operating guide and specificationsCheck the exact configuration and source conditions for your use.
Manufacturer specification · Listed as 'RF' under Sound in Nothing's specification table.
Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsNothing (US store, us.nothing.tech) — Ear (3a) product page with technical specificationsManufacturer specification
Sennheiser HD 660S2 — operating guide and specificationsRange endpoints need their stated threshold. They do not describe response flatness or prove better bass, detail or sound quality.
No source recorded for this side.
Manufacturer specification
Sennheiser HD 660S2 — operating guide and specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer specification · Adaptive ANC up to 45 dB (Nothing's laboratory theoretical maximum) over a 40–5000 Hz range, with Transparency Mode.
Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsThe 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 specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer specification · Three microphones per earbud (six in total) with Clear Voice Technology for calls; the buds also support call recording and Audio Snapshot where available.
Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsThe 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 specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer specification · Nothing laboratory results at 25 °C, 50% volume, AAC, other features at default settings; actual life varies with use. Talk time is listed separately (earbuds 4.5 h ANC on / 6 h ANC off; with case 18 h / 25 h).
Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsNothing (US store, us.nothing.tech) — Ear (3a) product page with technical specificationsThe 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 specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification · Nominal impedance; check that your amplifier or audio source can drive this load.
Sennheiser HD 660S2 — operating guide and specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification · Sennheiser describes these changes as the S2 revision of the HD 660S.
Sennheiser HD 660S2 — exact model specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer specification · Nothing X is for Android 8.0 and above and iOS 13 and above; on Nothing OS 1.5.6 and higher the settings are built into the phone. Custom EQ and Advanced EQ are listed under Sound features.
Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsNothing (US store, us.nothing.tech) — Ear (3a) product page with technical specificationsNo source recorded for this side.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer specification
Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsNo source recorded for this side.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification · Optional cables are sold separately; balanced cables need a balanced headphone output.
Sennheiser HD 660S2 — exact model specificationsSennheiser HD 660S2 — operating guide and specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification · Length of the supplied cable.
Sennheiser HD 660S2 — operating guide and specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer specification
Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsNo source recorded for this side.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification · The 4.4 mm balanced cable needs a balanced headphone output; an XLR-4 cable is optional.
Sennheiser HD 660S2 — exact model specificationsSennheiser HD 660S2 — operating guide and specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification · Nominal clamping force; individual fit and comfort can differ.
Sennheiser HD 660S2 — operating guide and specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer specification · Skip forward, skip back and noise control are marked customisable in the Nothing X app; custom controls need to be set up from a phone (footnote 5). Call recording is only available in selected regions (footnote 10).
Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsNothing (US store, us.nothing.tech) — Ear (3a) product page with technical specificationsNo source recorded for this side.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
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 specificationsSennheiser HD 660S2 — operating guide and specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification · Replacement procedure shown in the manual.
Sennheiser HD 660S2 — exact model specificationsSennheiser HD 660S2 — operating guide and specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer specification · Fast Pair works on supported Android devices running Google Play services 11.7+ (back to Android 6.0); Find My and device renaming support need Android 10 or later.
Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsNothing (US store, us.nothing.tech) — Ear (3a) product page with technical specificationsNo source recorded for this side.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification
Sennheiser HD 660S2 — operating guide and specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
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 specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer specification · Latency can be reduced to as low as 120 ms only when the earbuds are paired with Nothing phones with Game Mode turned on (footnote 3).
Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsNothing (US store, us.nothing.tech) — Ear (3a) product page with technical specificationsNo source recorded for this side.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification · Static magnetic field at the headphone surface.
Sennheiser HD 660S2 — exact model specificationsSennheiser HD 660S2 — operating guide and specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer specification · Dual connection is listed as Yes; Nothing describes dual-device connections on Android, Windows and iOS.
Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsNothing (US store, us.nothing.tech) — Ear (3a) product page with technical specificationsNo source recorded for this side.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification
Sennheiser HD 660S2 — operating guide and specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification · Rated at 1 kHz with 1 V rms; not directly comparable with dB/mW ratings.
Sennheiser HD 660S2 — operating guide and specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification · Replacement procedures are in the manual; spare-part availability varies.
Sennheiser HD 660S2 — operating guide and specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer specification · Listed under Sound features. Nothing says it spreads sounds across a virtual 3D field; the pages do not mention head tracking.
Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsNothing (US store, us.nothing.tech) — Ear (3a) product page with technical specificationsNo source recorded for this side.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification · Sennheiser does not give the frequency range or comparison model for this claim.
Sennheiser HD 660S2 — exact model specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
Nothing's table wording is 'IP54 water and water resistance for buds and case'. · Manufacturer specification
Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsNo source recorded for this side.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer specification · Each earbud. The charging case weighs 40.92 g.
Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsNo source recorded for this side.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer specification
Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsNothing (US store, us.nothing.tech) — Ear (3a) product page with technical specificationsNo source recorded for this side.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification · Approximate, without the cable.
Sennheiser HD 660S2 — operating guide and specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
0 shared fields have the same recorded value.
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| Specification | Nothing Ear (3a) | Sennheiser HD 660S2 |
|---|---|---|
Wearing styleDifferent SourcesNothing Ear (3a) Manufacturer specification · Two earbuds and a charging case; four pairs of ear tips are in the box. Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsSennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications | In-ear, true wireless (liquid-silicone ear tips in four sizes) | Over-ear (circumaural), open-back dynamic headphones |
Weight per earbud SourcesNothing Ear (3a) Manufacturer specification · Each earbud. The charging case weighs 40.92 g. Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsSennheiser HD 660S2 No source recorded. | 4.53 g | Not provided |
Dimensions SourcesNothing Ear (3a) Manufacturer specification Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsNothing (US store, us.nothing.tech) — Ear (3a) product page with technical specificationsSennheiser HD 660S2 No source recorded. | Each earbud 31.2 x 21.7 x 24 mm; charging case 64.8 x 48.95 x 22.8 mm (height x width x depth) | Not provided |
Dust, sweat and water resistance SourcesNothing Ear (3a) Nothing's table wording is 'IP54 water and water resistance for buds and case'. · Manufacturer specification Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsSennheiser HD 660S2 No source recorded. | IP54 (earbuds and case) | Not provided |
Weight SourcesNothing Ear (3a) 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 SourcesNothing Ear (3a) No source recorded. Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications | Not provided | Open-back |
Replaceable parts SourcesNothing Ear (3a) 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 SourcesNothing Ear (3a) No source recorded. Sennheiser HD 660S2 Manufacturer specification · Replacement procedure shown in the manual. Sennheiser HD 660S2 — exact model specificationsSennheiser HD 660S2 — operating guide and specifications | Not provided | Velour ear pads; replaceable |
Rated contact pressure SourcesNothing Ear (3a) 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 SourcesNothing Ear (3a) Manufacturer specification · The specification lists only Type-C wired charging (full in 70 minutes); no wireless case charging is listed. Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsSennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — exact model specificationsSennheiser HD 660S2 — operating guide and specifications | Bluetooth 6.0 (SBC, AAC, LDAC) with dual connection; USB-C charging on the case | 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 SourcesNothing Ear (3a) Manufacturer specification · Nothing laboratory results at 25 °C, 50% volume, AAC, other features at default settings; actual life varies with use. Talk time is listed separately (earbuds 4.5 h ANC on / 6 h ANC off; with case 18 h / 25 h). Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsNothing (US store, us.nothing.tech) — Ear (3a) product page with technical specificationsSennheiser 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 | AAC: earbuds up to 6 hours with ANC on and up to 10 hours with ANC off; with the charging case up to 25 hours with ANC on and up to 42 hours with ANC off. LDAC: earbuds up to 4.5 hours ANC on / 6 hours ANC off; with case up to 20 hours ANC on / 28 hours ANC off. | Not listed by the manufacturer |
Bluetooth codecs SourcesNothing Ear (3a) Manufacturer specification Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsSennheiser HD 660S2 No source recorded. | SBC, AAC, LDAC (Hi-Res certified) | Not provided |
Multipoint (dual connection) SourcesNothing Ear (3a) Manufacturer specification · Dual connection is listed as Yes; Nothing describes dual-device connections on Android, Windows and iOS. Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsNothing (US store, us.nothing.tech) — Ear (3a) product page with technical specificationsSennheiser HD 660S2 No source recorded. | Yes | Not provided |
Low lag mode SourcesNothing Ear (3a) Manufacturer specification · Latency can be reduced to as low as 120 ms only when the earbuds are paired with Nothing phones with Game Mode turned on (footnote 3). Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsNothing (US store, us.nothing.tech) — Ear (3a) product page with technical specificationsSennheiser HD 660S2 No source recorded. | Low lag mode (latency as low as 120 ms) | Not provided |
Quick pairing SourcesNothing Ear (3a) Manufacturer specification · Fast Pair works on supported Android devices running Google Play services 11.7+ (back to Android 6.0); Find My and device renaming support need Android 10 or later. Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsNothing (US store, us.nothing.tech) — Ear (3a) product page with technical specificationsSennheiser HD 660S2 No source recorded. | Google Fast Pair and Microsoft Swift Pair | Not provided |
Battery capacity SourcesNothing Ear (3a) Manufacturer specification Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsSennheiser HD 660S2 No source recorded. | Earbuds 55 mAh each; case 500 mAh | Not provided |
Included cable length SourcesNothing Ear (3a) 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 SourcesNothing Ear (3a) 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 specificationsSennheiser 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 SourcesNothing Ear (3a) 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 specificationsSennheiser 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 SourcesNothing Ear (3a) Manufacturer specification Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsSennheiser HD 660S2 Manufacturer specification · Sennheiser lists 38 mm as the transducer size. Sennheiser HD 660S2 — exact model specifications | 12 mm dynamic driver, 32 Ω, PMI+TPU diaphragm | 38 mm open dynamic transducer; aluminium voice coil and vented magnet system |
Spatial audio SourcesNothing Ear (3a) Manufacturer specification · Listed under Sound features. Nothing says it spreads sounds across a virtual 3D field; the pages do not mention head tracking. Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsNothing (US store, us.nothing.tech) — Ear (3a) product page with technical specificationsSennheiser HD 660S2 No source recorded. | Static Spatial Audio | Not provided |
Frequency responseDifferent SourcesNothing Ear (3a) Manufacturer specification · Listed as 'RF' under Sound in Nothing's specification table. Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsNothing (US store, us.nothing.tech) — Ear (3a) product page with technical specificationsSennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications | 20 Hz - 40,000 Hz | 8–41,500 Hz (−10 dB) |
Nominal impedance SourcesNothing Ear (3a) No source recorded. 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 | Not provided | 300 ohm |
Rated sensitivity SourcesNothing Ear (3a) No source recorded. 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 | Not provided | 104 dB SPL at 1 kHz, 1 V rms |
Frequency equalisation SourcesNothing Ear (3a) No source recorded. Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications | Not provided | Diffuse-field equalised |
Rated total harmonic distortion SourcesNothing Ear (3a) 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 specificationsSennheiser HD 660S2 — operating guide and specifications | Not provided | ≤0.04% at 1 kHz, 100 dB SPL |
Rated long-term input power SourcesNothing Ear (3a) 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 SourcesNothing Ear (3a) 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 SourcesNothing Ear (3a) 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 SourcesNothing Ear (3a) Manufacturer specification · Three microphones per earbud (six in total) with Clear Voice Technology for calls; the buds also support call recording and Audio Snapshot where available. Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsSennheiser 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 SourcesNothing Ear (3a) Manufacturer specification · Adaptive ANC up to 45 dB (Nothing's laboratory theoretical maximum) over a 40–5000 Hz range, with Transparency Mode. Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsSennheiser 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 |
Companion app SourcesNothing Ear (3a) Manufacturer specification · Nothing X is for Android 8.0 and above and iOS 13 and above; on Nothing OS 1.5.6 and higher the settings are built into the phone. Custom EQ and Advanced EQ are listed under Sound features. Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsNothing (US store, us.nothing.tech) — Ear (3a) product page with technical specificationsSennheiser HD 660S2 No source recorded. | Nothing X app: Custom EQ with profile sharing, Advanced EQ (an 8-band equaliser), customisable controls, find my earbuds, dual connection and firmware updates | Not provided |
Controls SourcesNothing Ear (3a) Manufacturer specification · Skip forward, skip back and noise control are marked customisable in the Nothing X app; custom controls need to be set up from a phone (footnote 5). Call recording is only available in selected regions (footnote 10). Nothing (UK store, nothing.tech) — Ear (3a) product page with technical specificationsNothing (US store, us.nothing.tech) — Ear (3a) product page with technical specificationsSennheiser HD 660S2 No source recorded. | Pinch controls on the earbuds: pinch for play/pause or to answer/end a call; double pinch to skip forward or decline a call; triple pinch to skip back; pinch and hold for noise control or volume up/down; double pinch and hold, or pinch both buds at once, for Audio Snapshot or call recording. | Not provided |
Static magnetic field at the surface SourcesNothing Ear (3a) No source recorded. Sennheiser HD 660S2 Manufacturer specification · Static magnetic field at the headphone surface. Sennheiser HD 660S2 — exact model specificationsSennheiser HD 660S2 — operating guide and specifications | Not provided | 4.5 mT |
Operating temperature SourcesNothing Ear (3a) No source recorded. Sennheiser HD 660S2 Manufacturer specification Sennheiser HD 660S2 — operating guide and specifications | Not provided | −10 °C to +55 °C |
Closest headphones to this pair by shared key specifications. Not a popularity ranking.
Each record represents an explicitly checked model and configuration. Original import: 5 Sept 2026; this is not its verification date. This is not a list of current offers or a popularity ranking.
