Viofo A139 3CH 3-channel dash cam review

Viofo’s A139 3CH three-channel, three-camera dash cam system is a first in our experience. We’ve tested three-channel products before, but the interior camera has always been integrated into the same body as the front camera. Viofo’s is separate, as is the rear camera.

The upside to this discrete interior camera approach is versatility in locating each camera. The downside, though easily surmountable, is that you have more cables to hide.

Design and features

The A139’s three cameras are also notable for their high resolution. The 140-degree FOV front camera is 1440p, while the 170-degree cabin (interior) and rear cameras are both 1080p. All manage 30 fps while recording simultaneously, which means there’s a fair amount of processing power under the hood. High-quality Sony STARVIS IMX335 sensors are used by all three cameras. 

main camera Viofo

Viofo’s A139 main (forward) camera body. There’s no display. Instead, the camera relies on a Wi-Fi-connected phone app for displaying live views and changing settings. 

The main (forward) camera body uses a sticky mount. The camera attaches/detaches from said mount by sliding to the left or right. There’s no adjustment once mounted (place carefully!), and there’s no display. Instead of the latter, the A139 relies on a Wi-Fi-connected phone app for displaying live views and changing settings. Feedback is provided by status lights, voice, and other audio clues. 

viofo a139 phone app IDG

The Viofo Phone app for the A139. The front live view and settings pages are shown.

On the back of the main camera are power, record on/off, emergency record (save), the microphone on/off, and Wi-Fi buttons. You must connect to the phone to change the numerous other settings, and you can’t record while doing so. Small matter–you shouldn’t be driving while using your phone anyway.

There’s quite a bit in the box to support three cameras, as you can see below.

packing list 1 Viofo

As you can see, the A139 packs a lot of stuff into the box, and there’s a lot of cabling to hide. If you have a powered mirror, grab an adapter to power the main camera. That will cut down on the clutter.

As I mentioned, the most problematic aspect of the A139 is the cabling. The cables are thin, and they snap into place using mini COAX connectors. How much of an issue they’ll be depends on where you place them.

With most cars, you’ll want to hide the main camera behind the rearview mirror (use an adapter to power the A139 if the mirror is powered), and the interior camera somewhere high up on the windshield so it covers as much of the back seat as possible. Viofo thoughtfully includes a spudger/crevasse tool for tucking the cables away behind molding.

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