... +2 CH audio,3G,GPRS,are optional 4ch 3G,GPS mini Car DVR with 3.5inch TFT screen,Car Black box,Vehicle DVR,mini mobile DVR JD-MDVR8800 series ... interface,4 CH video+2 CH audio,3G,GPRS,screen all are optional Function 1. Immediately auto record once power on; 2. Support ... image;19. With GPRS data transmission function, the real-time position of the vehicles can be tracked by mobile phone or computer ...