GSM frequency: 850/900/1800/1900; GPRS: upload 60, TCP / IP; Working voltage: DC 3.4~4.2V; Standby current: 2.5mA; Sound control current: 30mA; Talking current: 150mA; GSM positioning time: 35s; Working temperature: -20~70'C; Working humidity: 20~80%RH