4ch Ahd Car Bus Mobile Dvr Sd 3g Wireless Gps Realtime Video Recorder+4 Cameras

HD 1080P 3G 4G 4CH SD card Vehicle Mobile DVR Demo video

4ch ahd car bus mobile dvr sd 3g wireless gps realtime video recorder+4 cameras 2hdd/sd card error, remove storage device and turn on device checking. QIf using 3G, what should we concern? The seller is cute_uu2010 and is located in CN. Q Cant playback files on PC successfully? Confirm if the DVR was opened at that time, such as crashed midway park, loading and unloading ect.