Gps tracker 3 main functions: 1. Remote vehicle tracker - can track the vehicle' s position via mobile phone ( sms) and server - track the vehicle via the server history of travel 2. monitor vehicle remotely. - listen to the voice inside the vehicle through your mobile phone - monitor vehicle speed and the server via sms 3. remote vehicle security, - the unit will send info to mobile phone / server. if someone opens the car door and started the engine illegally. - can turn off the machine via sms if someone illegally started the engine and bring your vehicle running. The main advantages xt 103-2 is using components - components that are qualified to strengthen and stabilize the transmission signal gps / gsm / gprs. other than that is equipped with the latest processor arm7, xt103-2 has also been improved from previous versions in overcoming the tracking error, lost track, low signal gsm / gprs, and high cost.