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VIOFO A139 Pro 2CH Dash Cam

VIOFO A139 Pro 2CH Dash Cam

By VIOFO · Dash Cams · Audio & Electronics · More from VIOFO

  • Front sensor: Sony STARVIS 2 IMX678, 8MP, 1/1.8-inch
  • Front video: 4K (3840x2160) at 30fps with HDR
  • Rear video: 1080p at 30fps (Sony STARVIS IMX291)
  • Dual-band Wi-Fi 2.4GHz and 5GHz
  • microSD storage up to 512GB

Lowest price seen
$299.99
from $299.99 at The Dashcam Store · Checked Oct 14, 2026

New
Used, refurbished, open-box

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Problems, parts and running costs

Summary

The VIOFO A139 Pro 2CH is a no-screen front and rear dash cam whose front camera uses a Sony STARVIS 2 IMX678 sensor for 4K/30fps HDR, paired with a 1080p rear camera, built-in GPS and buffered parking mode. Buy it for strong front plate capture, but budget for a 256GB card and a hardwire kit, and know the rear camera is 1080p only and weakest at night.

Strengths

  • Built-in GPS, dual-band 5GHz Wi-Fi and buffered parking mode come in one unit with no separate GPS module or screen.
  • The included CPL-200 polarizing filter genuinely cuts windshield glare on sunny days.
  • The rear camera records 1080p and carries the same speed and GPS stamp as the front, so both angles stay usable as evidence.
  • The app handles setup, live view and GPS playback, and creates a VPN over its own Wi-Fi for reliable phone downloads.

Weaknesses

  • The rear camera is 1080p only, and at night it captures vehicle shapes and colours but few number plates from parked cars.
  • Storage appetite is high: front and rear together use more than 300MB per minute, so a 64GB card cycles in under four hours and 256GB is the practical minimum.
  • The main unit is bulky, and every extra camera adds a long cable; MakeUseOf called a fully wired three-camera setup a “railroad terminal”.
  • Installation is tedious, and only the front camera uses the electrostatic sticker while the rear uses a sticky pad.
  • The audio handling disliked the quiet ticking of an indicator in a stationary car, and the startup and shutdown sounds are harsh until you turn them off.
  • There is no ADAS, no SOS emergency feature and no voice control, and the rear CPL-300 filter is a paid extra.

Verified specifications

Channels2-channel front and rear.
Front cameraSony STARVIS 2 IMX678, 8MP 1/1.8-inch sensor, 4K at 30fps with HDR, F1.6 lens, 140° field of view.
Rear cameraSony STARVIS 2MP IMX291, 1080p at 30fps, F1.6 lens, 165° field of view.
ChipsetNovatek.
Wi-Fidual-band 2.4GHz and 5GHz; the upgraded 5GHz module is rated for 4X faster transfer than the previous generation.
GPSbuilt in and integrated into the mounting base.
Bluetoothbuilt in, supports the optional BTR200 remote with a stated 5m control distance.
Parking modebuffered parking mode with auto event detection, time-lapse and low bitrate recording.
G-sensorlow, middle or high sensitivity.
Loop recordingoff or 1, 2, 3, 5 or 10 minutes.
StoragemicroSD up to 512GB; the card is not included.
FormatsMP4 video and JPEG stills.
Displaynone; all configuration runs through the VIOFO app.
PowerDC 5V / 2A input with a built-in super capacitor and no battery; a hardwire kit is needed for parking mode.
Dimensionsfront unit 4.42 × 1.56 × 2.38 in (112 × 61 × 30 mm), 127 g; rear unit 2.64 × 1.10 × 1.33 in.
In the boxfront unit, rear camera, 6m rear cable, 4m USB-C power cable, car charger, mounting base with GPS, CPL-200 polarizing filter, trim tool, mounting stickers and a microSD-to-USB adapter.
Filtersfront CPL-200 included; rear CPL-300 optional.
External microphonesupported; the A139 series supports external microphones.
Voicevoice control is not supported; voice notifications are.
Warranty18 months for cameras and 12 months for accessories, with a 14-day return policy.
Full research notes and sources

Video quality

Daytime footage was crisp and clear, with number plates easy to read even at a closing speed, and the front camera’s dynamic range captured both bright sky and shadowed road detail. Rear footage was “much better than average” in daylight and handled dappled sunlight and high-contrast scenes well. At night the front camera dealt with reflective plates but washed them out under headlights, which the reviewer flags as normal for dash cams, while the rear camera captured the shape and colours of vehicles but struggled to make out number plates from parked cars, even aided by brake-light reflections. MakeUseOf tested the three-channel version of the same camera, called the front video “superb”, and scored the unit 6.50/10.

Storage, cards and running costs

The memory card is not included, and this camera fills it fast. Front and rear together consume more than 300MB per minute, so a 64GB card overwrote the oldest footage after less than four hours of driving; Trusted Reviews recommends at least 256GB, which would cover a long round journey of around 14 hours. VIOFO’s own industrial-grade U3 A2 V30 card in 64GB to 512GB costs $39.99. Parking mode needs a hardwire kit, which VIOFO lists at $17.99, and the fuse tap is sold separately at $15.99. A rear CPL-300 polarizing filter is another $12.99. A 256GB-class card plus the hardwire kit and fuse tap adds roughly $60 to $70 to the purchase.

Installation and size

One-channel installation was straightforward; adding cameras made the unit look less like a dash cam and more like a railroad terminal. Only the front camera mounts with the large electrostatic windshield sticker, and the rear camera uses a conventional sticky pad, which can be mounted upside down because the image can be inverted and flipped in settings.

App, features and parking mode

With no screen, the VIOFO app is a hard requirement. It provides live view, which helps aim a screenless camera, a file browser, view flipping, date-stamp toggles and exposure adjustment, and it charts downloaded footage with GPS data on a map. The camera also sets up a VPN over its own 2.4GHz or 5GHz Wi-Fi to make phone downloads more reliable. There are no advanced driver aids and no SOS emergency function, and voice control is unsupported, though voice notifications are. Buffered parking mode supports auto event detection, time-lapse and low bitrate recording, and the supplied dual-USB cigarette adaptor leaves a spare USB port free.

Is it worth it?

At VIOFO’s own US store the 2CH bundle was priced at $249.99 against a $329.99 regular price when this was checked. Trusted Reviews’ recorded price points were £237 in the UK and CA$440 in Canada, and the review text described the front and rear bundle as costing “a little more than £200”.

Which model this is

This page covers the VIOFO A139 Pro 2CH, the two-channel front and rear bundle with 4K front and 1080P rear. Do not confuse it with the 1CH, 3CH or 3CH-IR variants, which have separate product pages. The seed Amazon listing is ASIN B0BVVFGLJW.

Sources

Manufacturer:

Independent reviews:

Owner reports:

  • None located: no Reddit, forum or retailer Q&A thread for this model could be read during this check.

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