... mainborad to ensure stable working in complex > condition with vibration;> Hard disk auto-heating;> 3G(WCDMA/EVDO) WIFI GPS mudules optional for ... power-off;> Multiplex interface,one SD card slot,1 USB interface,6 alarm input,2 alarm output,2 RS485,1 ... extra external device,such as intercom,control pannle etc.;> Black box for vehicles,recording speed,position acceleration,temperature brakes,backing up ...