... DV 4 ch Bus security system with 3g ,GPS,wifi ,G-sensor Features audio/video compression technology;. 4-channel audio/video ... video input, 1-channel CVBS video output; 1.0Vp-p, 75ΩDual streamSupportOSDTime & date, vehicle ID, GPS etcCompression H. 264. Hisilicon ... such asCDMA, TD-SCDMA, EVDO,HSPA+ and WIFIG-SensorBuilt-in G-Sensor moduleOthersPower ManagementSystem auto power on/off modeVehicle acc on ...