... TCP protocol AT command,GSM/GPRS Modem,USB 2.0 Interface Along with wide range of multi utility, multi functional ... by AT Commands lInput Voltage 5.5V to 12V DClSIM Interface 3V/5VInterfacel15 PIN D connector (Optional: USB port)lRemote ... socketlSMA antenna connectorlSliding/fixed landing SIM holder (3V/5V SIM interface)ServicelData: Circuit asynchronous, transparent and non transparent modes, data ...