Supply Voltage : 10 to 20 Vdc Consumption : 1.25 W max, (5.5W Peak during Transmission burst) Serial Port : V24/CMOS, 2400 bps to 19200 bps Serial Protocol : V.25ter and GSM 07.05 & 07.07 RF Connector type : MMCX Operating Temperature : -5°C to 55°C Dimensions (W x H x D) : 4 DIN modules, 70mm Χ 86mm Χ 58mm Dual Band E-GSM900 / 1800 DIN Rail Mounting Serial Port