... .Wireless modem,industrial 2.GSM 900/1800MHz 3.Support SMS,Telephone,CSD 4.DB9 rs232 or 485 interface 5.Smallest:75 ... Text and PDU mode10.Wireless,no need to build expensive fixed line network, saving cost substantially11.Reliable GSM network connectivity, providing fast ... )SIM interfaces: 3V/1.8V Dimension&EnvironmentMinimum size in the line:75*50*16mm weight:200g Ambient temperature: -20°C~ +55 ...