... 4. Support DDNS IP modem, RS232 modem, GSM IP modem, GPRS data modem, data terminal,GPRS DTU, TCP/IP modem, Support transparent data ... BandEGSM900/GSM1800MHz, GSM850/900/1800/1900MHz(optional)Compliant to GSM phase 2/2+GPRS class 10, class 12(optional)Bandwidth85.6KbpsTX powerGSM850 ... IP30 protectionDimensions91x58.5x22 mm Weight205g support RS232/RS485 F2114 Industrial gprs gsm modem with I/O channels