GSM Module Dimensions L x W x H: 36.2 x 30 x 4.8 mm Operating temperature: -30...80 °C Power supply: 3.4...4.2 VDC Supply current (connected) calculated: 790 mA GPRS class: 12 Antenna connection: GSC Base frequency: 850 MHz / 900 MHz / 1800 MHz / 1900 MHz / 2100 MHz Supply current (off mode): 26 uA