1 Built-in SIRF StarIII Chipset, excellent for fixing the position even at a weak signal status. Work well even in areas with limited sky view like urban canyons. 2 Built-in GSM/GPRS module, support 4-frequency GSM 900/1800 MHz (850/1900 Optional), working all over the world. 3 Support SMS communication or GPRS TCP connection. Have Geo Fence Function, can set at least 100M. 4 Get the position information via mobile phone SMS, or examine the path on the Internet. 5 The available SMS takes the control command change tracing function or switch GPS. 6 Support establishes three telephone numbers. SOS button send out exact location for immediate rescue/action. One key for easily use. 7 The major technological index of the device is in conformity with the international standard of GSM mobile phone. 8 Portable, compact size, low power design. Support voice call. Applications 9 Guard against theft of strongbox, vehicle and outdoor equipments, cargo. 10 Monitor and protect child, elder and disabled. L1 Based on GSM network and INTERNET, this series of products provide personalized services for companies, organizations and individuals, users can search