Our device tracks vehicle by several ways including sms + map software, pda cellphone, real time tracking and track via your computer and google earth. it is a very simple and useful real-time tracking device, it can track 10,000pcs units in platform at one time. it widely used in both simple and large-scale monitoring, emergency scheduling, location-based services, traffic safety and many other areas of management. main features: quad-band 850/900/1800/1900mhz, global useavl gps tracker (automatic vehicle location)geofenceremote cut off oil and power system tracking function by timing and distance intervaldata loggingwith sd card slotmulti-area fleet management door open alarmacc alarm (ignition on/off alarm)movement alertover-speed alarmlow battery alarmcheck the vehicle statefuel alarmremote voice monitor/surveillance.