... ,employee,businessmen,outworker,pet,travller,lover,students gps gsm tracker factoryGeneral: Based on GSM/GPRS and GPS, you can locate and monitor any remote ... SMS or GPRS. Basic Operation: Insert SIM Card into GPS Tracker, use mobile phone to call this SIM number, you will get ... to the user if the battery is low. More functions: Data adds Direction, Altitude, Number of satellites, The length of the ...