... audio,3G,GPRS,are optional 4ch 3G,GPS mini Car DVR with 3.5inch TFT screen,Car Black box,Vehicle DVR,mini mobile DVR ... . And this powerful GPS tracking can be easily realized by cell phone, or PC (software).4ch mini car DVR with 3.5inch TFT ... ×50mmNet weight2.2 KGOptional FunctionsPanning Table control support GPS chart recorder(black box) 4ch 3G,GPS mini Car DVR with 3.5inch TFT screen