Features: Car Tracking Function: 1. Tracking car's position by GPS. Real time position tracking through SMS of mobile phone. ( the longitude and latitude, time, altitude) 2. Tracking car's position by GSM(please make sure that your local telecom already offered the mobile tracking service. ) Car Alarm Function: 1. Send SMS to cut off engine. 2. Send SMS to cancle cut off engine. 3. Able to connect to your original car alarm. To get SMS when the original car alarm was triggered. Such as door triggered. Technical Data: GSM Frequencies: 900Mhz/1800Mhz/1900Mhz Voltage for CPU: DC12V +(-) 2V Static Current < 20 mA Input Voltage: 6-30V DC Mainframe size: 106 MM *22 MM *63 MM