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