... 4. Support DDNS IP modem, RS232 modem, GSM IP modem, GPRS data modem, data terminal,GPRS DTU, TCP/IP modem, Support transparent data ... transfe, gprs ip modem, gsm modemgprs modem with rs232 rs485 io for m2m meter ... BandEGSM900/GSM1800MHz, GSM850/900/1800/1900MHz(optional)Compliant to GSM phase 2/2+GPRS class 10, class 12(optional)Bandwidth85.6KbpsTX powerGSM850 ...