... sky view like urban canyons. Built-in GSM/GPRS module, support 4-frequency GSM 850/900/1800/1900 MHz. Working all over the world ... the device is in conformity with the international standard of GSM mobile phone. Long battery life between charges Portable, ... of strongbox, vehicle and outdoor equipments, cargo. Based on GSM network and INTERNET, this series of products provide personalized services ...