The 70mai 4K A900 Ultra dash cam captures front footage at 3840 x 2160 pixels, with a rear camera recording at 2160P. The device is currently available for £206.79.
Image quality and performance
The Ultra's main feature is its 4K recording capability. High-resolution video helps in reviewing incidents, allowing you to examine road signs, vehicle movements, and other visual details that might be difficult to spot in lower-resolution footage.
Changing light is one of the biggest challenges for an in-car camera. Bright sunlight can obscure details, while tunnels, shaded roads and night-time driving can leave important parts of an image underexposed. The A900 Ultra's image-processing features are intended to help balance these conditions, preserving detail across brighter and darker areas of a scene. This is useful when driving into low sunlight, passing beneath bridges or recording traffic against a bright sky.
Night-time performance is also very decent, with the dash cam reducing noise and suppressing glare, keeping road signs readable and shrinking blind spots.
Installation and storage
The installation process of the Ultra is pretty standard - you'll need your mobile and don't switch on the engine; otherwise, you might get a bunch of wifi connection issues.
You do get a 64GB MicroSD card with the unit, but since you are collecting so much 4K footage, you might want to at least double it. Nevertheless, you do have buffered emergency recording, which means you'll always get ten seconds to three minutes before any incident and 30 seconds after - with all critical footage automatically saved to an emergency folder that is easily accessed through the app.
Additional features and accessories
To get the most out of the camera, you'll need to invest in the 4G hardwire kit, which offers smart parking mode and lets you access the camera via the app anytime, anywhere. This is all standard fare, but the 70mai battery pack hasn't been tried before.
It's not cheap (essentially costing the same as the camera itself), but it does offer you peace of mind. When the dash cam is in parking mode, it draws power from your car's battery until it reaches a voltage limit (which may come sooner than you think, depending on the state of the car's battery). This is when the battery pack swoops in, keeping it going much longer.
User feedback and alternatives
Users say: "The picture quality is superb day and night, with a nice clear picture." Another user notes: "Overall, this is still a good dash cam with excellent daytime footage, useful front and rear recording, a good app and plenty of additional features."
Alternatives include the DDPAI N4T Pro 3 Channel Dash Cam 4K and the Miofive S1 Pro Dual Dash Cam 4K+2K.
