RS232 GSM/GPRS modem Based on SIMCOM module SIM900 With TCP/IP protocol stack 850/900/1800/1900MHZ SMS,data, STK, internet RS232 GSM/GPRS modem can be ... SIM900 With TCP/IP protocol stack850/900/1800/1900MHZComply with ETSI GSM phase 2+1.8V-3V SIM card slotDB9 RS232 ... +85 degreesSize 85*54*25mmWeight 110gAccessories: AC/DC adaptor,RS232 cable, antenna, 2 mounting plates, CD Specification for DataGPRS ...