SIM300DFeatures qTriBandGSM/GPRS900/1800/1900MHz qComplianttoGSMphase2/2+ qGPRSClass10/8 qOutputpower:Class42WforEGSM900 Class21WforGSM1800/GSM1900 qControlviaATcommands qTCP/IPstack qSIMapplicationtoolkit qSupplyvoltagerange:3.4-4.5VDC qTemperaturerange:-20℃to+55℃(operationalfunctionality) -40℃to+85℃(storagetemperature) qDimensions:33x33x3.0mm qWeight:8g qVoice:FR/EFR/HR/AMR,noisesuppressionandechocancellation PCMaudio,Emergencycalls qSMS:TextandPDUmode,Pointtopoint(MO/MT),Cellbroadcast qDATA:nontransparent,CSDupto14.4kbps,USSD, qInterfaces:SMDpackage,UART,KeypadandLCD,etc.Accessories qGSM/GPRSantennas qSIMcardholder qRFConnectors