We looked at this dash cam's predecessor, the Viofo A139 3CH, back in 2021 (where does the time etc). For that review, we had the 3CH triple-camera setup (front, interior, rear). This time, we've been testing the Pro 2CH IR system (front, interior).
If you're slightly confused about these somewhat cryptic product names, join the club. Picking the perfect Viofo for your needs is more perplexing than it perhaps needs to be. The Viofo A139 Pro Series has four different configurations, with more or fewer cameras, depending on the name: Viofo A139 Pro 2CH (front, rear); Viofo A139 Pro 2CH IR (front, interior); Viofo A139 Pro 3CH (front, interior, rear) and - yes! - the Viofo A139 Pro 1CH (front).
At least all the front-facing cameras are true 4K UHD HDR, so whichever system you plump for, you're going to get excellent footage. The main cam shoots 4K at 3,840 x 2,160P, which translates to a 16:9 letterboxed aspect ratio. Given the crisp, rich colours...