Major function: - Build-in GPS Vehicles locator. - 4-frequency GSM 850/900/1800/1900 MHz which can Work worldwide - track the real time address - Built in battery 150 mAh - Geo-Fence - Main Power Off Alarm - single location - Over Speed Alarm - Low Power Alarm - Waterproof - With ACC to detect ignition - Historical track playback -Remote oil cut-off -Remote power off Specifications: Specifications             76*27*14(mm)/0.03kg GSM Frequency         850/900/1800/1900MHz Positioning chip                MTK integrated GPS Positioning accuracy                               5m Positioning speed                              35S Positioning sensitivity                        -159dbm Working voltage                          12-100v Backup battery 3.7V  150mAh Working temperature -20°C~55°C Working humidity 5%--95% Battery protection: 100V high voltage Platform and APP: Website: http://3.tkstargps.net/  APP installation: Open the website and scan the QR code to download. Trial account:83248535  password:888888 When you choose our GPS tracker,you could FREE use the tracking software platform for lifetime.