I have had the A800S for a month and very unhappy with the video quality, signs/license plates are unreadable unless really closr and at a standstill. I have the 70Mai Pro and that dashcam has a much better video quality.
70Mai support are refusing to acknowledge that there is an issue and saying it looks perfectly normal!
I examined the videos from the A800S, and it seems to be using a very low bitrate which might be the reason behind the bad quality. I compared the bitrate with another 4K dashcam from another brand and it is almost half, which explains the small file size. 70Mai does not allow for a user selected bitrate which makes no sense!