SIM300Features TriBandGSM/GPRS900/1800/1900MHz ComplianttoGSMphase2/2+ GPRSClass10/8 Outputpower:Class42WforEGSM900 Class21WforGSM1800/GSM1900 ControlviaATcommands TCP/IPstack SIMapplicationtoolkit Supplyvoltagerange:3.4-4.5VDC Temperaturerange:-20℃to+55℃(operationalfunctionality) -40℃to+85℃(storagetemperature) Dimensions:40x33x2.85mm Weight:8g Voice:FR/EFR/HR/AMR,noisesuppressionandechocancellation PCMaudio,Emergencycalls SMS:TextandPDUmode,Pointtopoint(MO/MT),Cellbroadcast DATA:nontransparent,CSDupto14.4kbps,USSD, Interfaces:UART,RFconnector,60pinsystemconnector, KeypadandLCD,etc.Accessories GSM/GPRSantennas 60pinsystemconnector SIMcardholder U.FLtoSMARFcable