... HDD interface,4 CH video+2 CH audio,3G,GPRS,are optional 4ch 3G,GPS mini Car DVR ... to a computer. The VR8800GP also supports GPS and GPRS, thus making it possible for GPS tracking of vehicles. ... HDD interface,4 CH video+2 CH audio,3G,GPRS,screen all are optional Function 1. Immediately auto record ... will be stamped on the video image;19. With GPRS data transmission function, the real-time position of the ...