... IP modem, RS232 modem, GSM IP modem, GPRS data modem, data terminal,GPRS DTU, TCP/IP modem, IP WIRELESS MODEM, SIMCOME MODEM, 3G IP MODEM, EDGE MODEM,gsm ... to GSM phase 2/2+Support SMS and CSD function Interfacehigh-powered MCU, 100MRS232 serial port, rates: 110 ... : -40~+85ºCHumidity: 95% (unfreezing)Software functionDesign with standard TCP/IP protocol stackAdopt smart online keeping technology to ...