Support GSM 850/900/1800/1900 MHz. Works worldwide - High sensitivity use JRC low-power high-sensitivity GPS chipset which is more accuracy than SiRF star III - Excellent for fixing the position even at a weak signal status work well even in areas with limited sky view like urban canyons - Fast Signal Acquisition - Support single location and continuous tracking by SMS - Support alarm can set 3 preset phone numbers - Support check location and real-time and historical records by SMS or Internet - SOS button send out exact location for immediate rescue/action. - Support cut-off engine or power oil - High reliability circuit design in line with the automotive electronics industry standards - Very easy to operate and install - Built-in tremble sensor to save power from GPS module on/off - Powered by rechargeable 700mAh battery - Package included: - 1 * GPS/GSM tracker - 1 * Rechargeable 700mAh battery - 1 * Connecting cable - 1 * Software CD CD: http://m5.img.dxcdn.com/CDDriver/CD/sku.54072.zip