GSM Module(1 GSM Port):The GSM is a module with 1 GSM port to terminate GSM network.It can be used in S20, S50, S100, S300.Warranty: 24 MonthsGSM Parameters:GSM channels: 1 Channels;Network types: 850/900/1800/1900 MHz (quad-band) ;GSM engine: SIMCom;Transmitter power: +33dBm(2W) 850/900MHz,+30dBm(1W) 1800/1900M ;SIM card: 1 SIM per channel, Small plug-in, 3V ;