VIOFO asserts that its latest A139 Pro records "real" 4K HDR video, unlike many dash-cams marketed with that spec. It is also equipped with Night Vision 2.0 powered by up-to-date tech from Sony and "upgraded" Wi-Fi, as well as the front, rear and in-cabin view support that ride-sharing customers and drivers in particular may find welcome.https://www.notebookcheck.net/VIOFO-A139-Pro-is-touted-as-the-first-ever-real-4K-3-channel-dashcam-with-Sony-STARVIS-2-night-vision-and-HDR.669427.0.html
before buying dashcam i did alot of reasearch and at that time ONLY viofo was offering TRUE 4k dashcams other companies were marketing 4k but actually was fake 4k,bit rate was either too low or resolution didnt match 4k... i got my self a129pro and its amazing ,thats why i believe this one is even better one.
VIOFO,blackvue,thinkware...those are the compaies that are on top so if buying choose wisely or at least go check dashcamtalk forum.