Features:1.Use SIM card (Not included)2.Sound control dialing3.Environmental surveillance4.LBS Positioning5.SOS Emergency Call6.Real Time 4 bands GSM/GPRS7.Operation Frequency: GSM850/900/1800/1900MHz8.VOX Back Call9.12 days standby timeParameters:Size: 43.2 x 32 x 13.6 mmWeight: 30gConnection: GSM / GPRSGSM Frequency: 850/900/1800/1900 MHzCharger Input: AC110-220V 50/60 HzCharger Output: DC5V 500mABattery: Rechargeable battery 3.7V 500mA Li-ion batteryStorage Temperature: -40 to 80 degreesWorking Temperature: -20 to 55 degreesHunidity: 5%-95% non-condensing