Skip to specifications
versus.deals
Menu
Browse versus.deals
PROJECTORS

BenQ TH685i

exact TH685i UK manufacturer catalogue configuration

Projected resolution
1080P (1920x1080)
Projection technology
DLP
Light source
Lamp

BenQ TH685i in its exact UK manufacturer catalogue configuration. Compare the declared projected image, actual light-source and brightness basis, optical placement and source-listed inputs together.

Prices & buying options

UK
Search Amazon UKSearch eBay UK
US
Search Amazon USSearch eBay US

Search links open retailer results.

UK: no verified listing yet · checked daily

US: no verified listing yet · checked daily

As an eBay Partner, we may be compensated if you make a purchase.

Affiliate links

We may earn a commission. Search results can include other models; check the exact variant and final price with the retailer.

As an Amazon Associate I earn from qualifying purchases.

Price alert

Email me when the BenQ TH685i gets cheaper on eBay. We check exact-model listings once a day at 12:00 UTC.

We'll send a link to confirm first.

THE ACTUAL PRODUCT
BenQ TH685i — exact-model official product image.
Official product image · Image source detailsProduct imagery does not establish a retailer’s bundle or condition.
Compare with BenQ TH685P
Explore alternativesUpgrade from this product

Specifications checked 17 Oct 2026Manufacturer specifications, not a hands-on test.

Options worth comparing

Explore all alternatives

The nearest checked projectors by key specifications, with what differs from the BenQ TH685i. The first matches the Compare button above.

BenQ TH685P — exact-model official product image.BenQ TH685PTH685P · exact TH685P UK manufacturer catalogue configuration
Connections
(x2), HDMI-1 (2.0b/HDCP2.2), HDMI-2 (2.0b/HDCP2.2) (HDMI in); (x1), USB Type A-1 (2.0/Power Supply1.5A) (USB Type A); 1 × RS232 in (DB-9pin); 1 × Audio in (3.5mm Mini Jack); 1 × Audio out (3.5mm Mini Jack)This one: PC in (D-sub 15pin) ((x1), PC in-1 (shared with component video)); (x2), HDMI-1 (2.0b/HDCP2.2), HDMI-Internal (2.0b/HDCP2.2) (HDMI in); (x1), USB Type A-1 (2.0/Power Supply1.5A) (USB Type A); 1 × RS232 in (DB-9pin); 1 × Audio in (3.5mm Mini Jack); 1 × Audio out (3.5mm Mini Jack)
Compare the two
BenQ TH585P — exact-model official product image.BenQ TH585PTH585P · exact TH585P UK manufacturer catalogue configuration
Throw ratio
1.5~1.65This one: 1.127~1.46
Connections
(x2), HDMI-1 (1.4a/HDCP1.4/MHL), HDMI-2 (1.4a/HDCP1.4/MHL) (HDMI in); (x1), USB Type A-1 (2.0/Power Supply1.5A) (USB Type A); 1 × RS232 in (DB-9pin); 1 × Audio in (3.5mm Mini Jack); 1 × Audio out (3.5mm Mini Jack)This one: PC in (D-sub 15pin) ((x1), PC in-1 (shared with component video)); (x2), HDMI-1 (2.0b/HDCP2.2), HDMI-Internal (2.0b/HDCP2.2) (HDMI in); (x1), USB Type A-1 (2.0/Power Supply1.5A) (USB Type A); 1 × RS232 in (DB-9pin); 1 × Audio in (3.5mm Mini Jack); 1 × Audio out (3.5mm Mini Jack)
Compare the two
BenQ EH600 — exact-model official product image.BenQ EH600EH600 · exact EH600 UK manufacturer catalogue configuration
Throw ratio
1.49~1.64This one: 1.127~1.46
Connections
PC in (D-sub 15pin) (PC in-1 (shared with component video)); 1 × Monitor out (D-sub 15pin); (x1), HDMI-1 (1.4a/HDCP1.4) (HDMI in); (x3), USB Type A-1 (2.0/Power Supply1.0A/Reader), USB Type A-2 (2.0/Power Supply1.5A/Reader), USB Type A-3 (2.0/Wireless Dongle) (USB Type A); (x1), USB Type Mini B-1(service/Page up&down) (USB Type Mini B); 1 × RS232 in (DB-9pin); 1 × Audio in (3.5mm Mini Jack); 1 × Audio out (3.5mm Mini Jack)This one: PC in (D-sub 15pin) ((x1), PC in-1 (shared with component video)); (x2), HDMI-1 (2.0b/HDCP2.2), HDMI-Internal (2.0b/HDCP2.2) (HDMI in); (x1), USB Type A-1 (2.0/Power Supply1.5A) (USB Type A); 1 × RS232 in (DB-9pin); 1 × Audio in (3.5mm Mini Jack); 1 × Audio out (3.5mm Mini Jack)
Compare the two
The useful part.

Key strengths

The manufacturer supplies model-specific projection, placement and connection specifications. Use the stated throw ratio, actual image size and lens configuration to plan your installation.

Manufacturer source
The checks that matter.

Before you buy

Manufacturer image and brightness claims are not an independent picture-quality test. Physical imager pixels, input limits, measurement methods, bundled TV devices and regional accessories need their own stated source scope; no overall winner or current stock is established.

Manufacturer source
Every specification. With its source.

Full specifications

Suggest a correctionOur publishing standard

Exact configuration: TH685i · exact TH685i UK manufacturer catalogue configuration

47 specifications in 7 groups. Values are manufacturer specifications unless a row says “Measured result” or “Calculated from cited specifications”. 7 rows repeat listed facts in the manufacturer’s own wording, kept under “Manufacturer wording”.

Projection & image

10 items
Projected resolution
1080P (1920x1080)

Source label Resolution. This is the manufacturer display/projected-image claim; it does not independently establish the physical DMD/imager pixel grid. Accepted signal resolution remains separate.

Source
Projection technology
DLPSource
Physical imager pixel grid
Not listed by the manufacturer

A physical imager pixel grid is not separately established by these supplied sources. The declared display/projected resolution and chip diagonal do not fill this field.

Source
Native Aspect Ratio
16:9

Manufacturer section Display. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
Contrast Ratio (FOFO)
10,000:1

Manufacturer section Display. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
Display Color
30-bit (1.07 billion colors)

Manufacturer section Display. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
Rec. 709 Coverage
95%

Manufacturer section Picture. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
Picture Modes
3D, Bright, Cinema, Game, HDR, HLG, Living Room, Sports, User 1, User 2

Manufacturer section Picture. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
Resolution Support
VGA (640 x 480) to 4K UHD (3840 x 2160)

Manufacturer section Compatibility. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
Projection System
DLP

Manufacturer section Projection System. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
Manufacturer wording (1)

The same facts in the manufacturer’s combined or original wording, each with its source.

Resolution
1080P (1920x1080)

Manufacturer section Display. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source

Light source & brightness

5 items
Light source
LampSource
Published ANSI brightness
3500 ANSI lm

Actual source field Brightness (ANSI lumens): 3500. Manufacturer measurement/mode qualifications remain in the full specifications; no cross-method conversion.

Source
Brightness (ANSI lumens)
3500

Manufacturer section Display. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
Light Source
Lamp

Manufacturer section Display. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
Light Source Life
a. Normal 4000 hrs, c. SmartEco 8000 hrs, d. LampSave 15000 hrs, b. ECO 10000 hrs

Manufacturer section Display. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
Manufacturer wording (1)

The same facts in the manufacturer’s combined or original wording, each with its source.

Brightness
3500 ANSI lumens

Manufacturer claim. Actual published method: ANSI lumens. Centre brightness, dynamic contrast and other lumen methods remain separate; no conversion or measured performance is asserted. Manufacturer section Display. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected. Source field: Brightness (ANSI lumens).

Source

Lens, placement & image size

7 items
Minimum optical throw ratio
1.127

Exact manufacturer optical throw row: 1.127~1.46. Applies to the listed lens/configuration; digital zoom, keystone and throw distance remain separate.

Source
Maximum optical throw ratio
1.46

Exact manufacturer optical throw row: 1.127~1.46. Applies to the listed lens/configuration; digital zoom, keystone and throw distance remain separate.

Source
Zoom Ratio
1.3x

Manufacturer section Optical. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
Lens
F/#=1.94~2.07;f=11.9~15.5 mm

Manufacturer section Optical. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
Projection Offset (Full-Height)
105%

Manufacturer section Optical. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
Keystone Adjustment
1D, (Auto) Vertical ± 40 degrees

Manufacturer section Optical. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
Universal Ceiling Mount
CM00G3, (Optional)

Manufacturer section Accessories. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
Manufacturer wording (2)

The same facts in the manufacturer’s combined or original wording, each with its source.

Throw ratio
1.127~1.46Source
Throw Ratio
1.127~1.46

Manufacturer section Optical. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source

Connections & accepted signals

8 items
Connections
PC in (D-sub 15pin) ((x1), PC in-1 (shared with component video)); (x2), HDMI-1 (2.0b/HDCP2.2), HDMI-Internal (2.0b/HDCP2.2) (HDMI in); (x1), USB Type A-1 (2.0/Power Supply1.5A) (USB Type A); 1 × RS232 in (DB-9pin); 1 × Audio in (3.5mm Mini Jack); 1 × Audio out (3.5mm Mini Jack)

Source-listed physical inputs, outputs and controls. Service USB, power outputs, connector versions and eARC claims retain their separate scopes; no full-bandwidth or compatibility guarantee inferred. Manufacturer section I/O Interface. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected. Source field: PC in (D-sub 15pin). Manufacturer section I/O Interface. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected. Source field: HDMI in. Manufacturer section I/O Interface. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected. Source field: USB Type A. Manufacturer section I/O Interface. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected. Source field: RS232 in (DB-9pin). Manufacturer section Audio. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected. Source field: Audio in (3.5mm Mini Jack). Manufacturer section Audio. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected. Source field: Audio out (3.5mm Mini Jack).

Source
Input Lag
16.7 ms (1080P 60Hz), 33.4 ms (4K 60Hz) *downscaling to 1080p, 8.3 ms (1080P 120Hz)

Manufacturer section Compatibility. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
Horizontal Frequency
15K~102KHz

Manufacturer section Compatibility. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
PC in (D-sub 15pin)
(x1), PC in-1 (shared with component video)

Manufacturer section I/O Interface. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
HDMI in
(x2), HDMI-1 (2.0b/HDCP2.2), HDMI-Internal (2.0b/HDCP2.2)

Manufacturer section I/O Interface. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
USB Type A
(x1), USB Type A-1 (2.0/Power Supply1.5A)

Manufacturer section I/O Interface. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
RS232 in (DB-9pin)
(x1)

Manufacturer section I/O Interface. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
HDMI Audio Return
ARC, 5.1 channel

Manufacturer section Audio. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
Manufacturer wording (2)

The same facts in the manufacturer’s combined or original wording, each with its source.

Audio in (3.5mm Mini Jack)
(x1)

Manufacturer section Audio. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
Audio out (3.5mm Mini Jack)
(x1)

Manufacturer section Audio. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source

Software, audio & accessories

6 items
Speaker
(x1), 5W Chamber

Manufacturer section Audio. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
Android TV dongle
QS01, (Standard)

Manufacturer section Accessories. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
Carry Bag
5J.J3T09.001, (Optional)

Manufacturer section Accessories. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
Power Cord (by region)
x1 (1.8M)

Manufacturer section Accessories. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
Quick Start Guide
(x1) 21L

Manufacturer section Accessories. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
Warranty Card (by region)
Yes

Manufacturer section Accessories. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source

Size & weight

5 items
Weight
2790 g

Manufacturer Net Weight (kg): 2.79. Kilograms normalized to grams; packaging/gross mass and separately listed accessories are not substituted.

Source
Dimensions (WxHxD) (mm)
312 x 110 x 225

Manufacturer section Dimension & Weight. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
Net Weight (kg)
2.79

Manufacturer section Dimension & Weight. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
Dimensions (WxHXD) (inch)
12.28 x 4.3 x 8.85

Manufacturer section Dimension & Weight. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
Net Weight (lb)
6.15

Manufacturer section Dimension & Weight. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
Manufacturer wording (1)

The same facts in the manufacturer’s combined or original wording, each with its source.

Dimensions
312 x 110 x 225 mm

Manufacturer axes, original measurement units and foot/handle/configuration basis remain literal. Packaging dimensions are separate. Manufacturer section Dimension & Weight. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected. Source field: Dimensions (WxHxD) (mm).

Source

Power, noise & operating conditions

6 items
Operating Temperature
0~40℃

Manufacturer section Environment. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
Power Supply
AC 100 to 240 V, 50/60 Hz

Manufacturer section Environment. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
Typical Power Consumption (110V)
297W/110V

Manufacturer section Environment. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
Stand-by Power Consumption
<0.5W

Manufacturer section Environment. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
Acoustic Noise (Typ./Eco.)(dB)
35/29 dB

Manufacturer section Environment. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
Remote Control w/ Battery
RCI067

Manufacturer section Accessories. Original units, optical/digital basis, input modes, test qualifications and regional accessory scope retained. No apparent source error is silently corrected.

Source
Similar products.

Compare with another projector

More of the nearest checked projectors by key specifications, for a side-by-side comparison.

BenQ MH550 — exact-model official product image.BenQ MH550mh550 · exact MH550 UK manufacturer catalogue configurationCompare the two BenQ TH671ST — exact-model official product image.BenQ TH671STth671st · exact TH671ST UK manufacturer catalogue configurationCompare the two BenQ MH536 — exact-model official product image.BenQ MH536MH536 · exact MH536 UK manufacturer catalogue configurationCompare the two BenQ MX825STH — exact-model official product image.BenQ MX825STHMX825STH · exact MX825STH UK manufacturer catalogue configurationCompare the two BenQ MW826STH — exact-model official product image.BenQ MW826STHMW826STH · exact MW826STH UK manufacturer catalogue configurationCompare the two BenQ LH550 — exact-model official product image.BenQ LH550LH550 · exact LH550 UK manufacturer catalogue configurationCompare the two BenQ TK700 — exact-model official product image.BenQ TK700tk700 · exact TK700 UK manufacturer catalogue configurationCompare the two BenQ W1800i — exact-model official product image.BenQ W1800iw1800i · exact W1800i UK manufacturer catalogue configurationCompare the two
See all 218 projectors Product image sources

Chosen by similarity in our catalogue, not by popularity.

Compare more projectors Browse projectors