Product information: Size: 64mm x 46mm x 17mm(1.8 "* 2.5" * 0.65 ") Network: GSM/GPRS Network frequency band: 850/900/1800/1900Mhz Chip: UBLOX chip GPS sensitivity:-159dBm GPS accuracy: 5m Car charger voltage: 12-24V input / 5V output Handheld fixed charger voltage: 110-220V input / 5V output Battery: Chargeable changeable 3.7V 800mAh Li-ion battery Standby duration: 24hours Storage Temperature:-40°C to +85°C Operating temperature:-20°C to +55°C Humidity: 5%-- 95% non-condensing