... 4. Support DDNS IP modem, RS232 modem, GSM IP modem, GPRS data modem, data terminal,GPRS ... Support transparent data transfe, gprs ip modem, gsm modemgprs modem with rs232 rs485 io for m2m meter ... port that can conveniently and transparently connect one device to a cellular network, allowing you to connect ... GSM1800MHz, GSM850/900/1800/1900MHz(optional)Compliant to GSM phase 2/2+GPRS class 10, class ...