... /1800 MHz 4.internet, SMS, data WIRELESS USB MODEM,GPRS modem,CDMA modem, HSUPA modem, Wireless modem,RS232 MODEM, industry MODEM, ... GPRS network and adopts industrial wireless GPRS module.It supports SMS, CSD and data function.EF1103 GPRS modem is ... environment protection,electric power system,post and weather fields.Wireless SpecificationEGSM900/GSM1800GPRS multi-slot class 10Compliant to GSM phase ...