The first front and rear dash cam to support 4K resolution. Plenty of cutting-edge features such as cloud connectivity, buffered parking mode, Wi-Fi, and voice menu. Rear camera is 1080p.
BlackVue DR900S-2CH
Category: 3840×2160
3840×2160 is more commonly known as 4K resolution. True 4K dash cams are quite new and still relatively rare. Make sure not to buy a fake. The ones listed here have been confirmed to be real.
ThiEYE T5e
An action cam recording at 4K (3840×2160) resolution. Can easily be used as a dash cam. Also records 1080p at up to 120fps, or 720p at 240fps. Wi-Fi. Electronic Image Stabilization. Batteries included.