70mai 4K A900 Ultra dash cam review: potent performance from twin cameras

70mai 4K A900 Ultra: two-minute review While many of the best dash cams on the market come with plenty of features and functions, not all of them boast 4K shooting capability.

The dual-channel 70mai 4K A900 Ultra captures 4K footage not only with its front-facing camera, but also with the rearward-facing unit that makes up this potent dash cam bundle.

This camera combo benefits from Sony Starvis 2 IMX678 sensors in both units too, which combined with the 4K, HDR and 70mai’s own Night Owl Vision 2.0 processing, means the bundle is perfect for capturing footage night and day.

The resolution is impressive, with the f/1.8 front lens capable of shooting 3840 x 2160P (4K) at 30fps, and the f/1.6 rearward camera able to shoot the same 4K quality at 25fps.

The field of view for both units is a generous 130 degrees.

The rest of the specification is similarly impressive, with the chunky main camera featuring a 3-inch rear-facing screen and four control buttons, which makes adjusting settings and previewing footage easy.

There is a 5-system built-in GPS, and buffered emergency recording that captures up to 3 minutes and ten seconds before and 30 seconds after an incident.

Bonus appeal is delivered with the likes of 70mai’s Smart Parking Surveillance 2.0 (subject to hardwiring the unit into a vehicle), a Driver Fatigue Alert, and 4G Cloud+ 2.0 compatibility that delivers a live view, remote playback and two-way voice communication that covers all bases on the security front.

While capturing 4K footage soon amasses lots of chunky files, the 70mai 4K A900 Ultra features Wi-Fi 6, which means the transfer of footage and general file management is both quick and easy, with speeds of up to 45MBps.

Another plus of the 70mai 4K A900 Ultra comes via compatibility with 70mai’s Battery Pack Mini, which gives assured backup power, and up to 30 days of parking surveillance without draining your vehicle’s battery. (Image credit: Future) Topping off an impressive set of features is hands-free voice control, while the unit itself features supercapacitor technology that offers more durable performance across the ranged of temperatures that occur inside vehicles over time.

All of this is squeezed into a compact box-shaped design for the main camera unit, while the rearward-facing camera is a fairly typical tube-shaped design.

Both units can be attached to screen glass using supplied adhesive pads, and everything needed for the job comes inside the box.

The 70mai 4K A900 Ultra is therefore a one-stop solution, although it is worth noting that a hardwire kit, which unlocks the potential of around-the-clock surveillance monitoring, will need to be purchased separately.

Otherwise, the units can be powered via a standard 12V in-car power socket, for which an adapter is supplied.