... huawei 3g usb modem, huawei modem, huawei 3g, hsdpa wireless modem, wcdma modem, hsdpa, modems, gsm modem,internet ... protection,electric power system,post and weather fields.Wireless SpecificationEGSM900/GSM1800GPRS multi-slot class 10Compliant to GSM ... +Support DTMFSupport SMS and CSD functionStandard AT command interface InterfaceRS232 serial port, rates: 110~230400bits/sIndicator lights: “Power”, ...