... >>Frequency : Quad-Band 900/1800/850/1900>>SIM Card : Supporting 3V SIM Card>>Antenna : 50 Ω SMA Antenna interface>>Serial : RS- ... 0V-3.3V level signal>>Exterior dimension: 95×63×25mm>>Net Weight : 300 g >>>>>Standard Package list: >>GSM Controller x1>>Power ... to contact us. Skype: Samchinese New Upgrading,GSM SMS Controller,RTU5011,Temperature UP DOWN remote control,24V DC Switch,NC NO sensor control