... 3G DV 4ch Bus security system HD WIFI+3G+GPS Car tracker 3g Car DVR Features audio/video compression technology;. 4-channel ... audio/video input;.ASF standard file format;.3G, GPS, Wi- ... OutputUp to 1 alarm output, level signal.OptionalFunctionGPSWth GPS module, GPS information recording together with videoNetworkRJ45 Ethernet port.Support ...