Product SpecificationUSB GSM modem poolGSMGPRS: 9001800MHz1 x SIM card(bigsmall) slotsWireless access to internetComply with GSM phase2 standardSend and receive SMS, MMS, Remote ControlMaximum transmitting speed 115KBpsInput voltage: 100 to 240VWorking temperature: -20 to +60 degrees CelsiusStorage temperature: -25 to +70 degrees CelsiusDouble tone multi-frequency function(DTMF)