... it can transmit data from apparatus (thermometer, humidity meter, electric meter, flow meter) to user or monitoring center by SMS(GSM DTU ... inputs, 0-53mA, 10 precision(RTU5011)>>Reliable performance with built-in double watchdog>>Automatic device condition report through SMS ... : Samchinese New Upgrading,GSM SMS Controller,RTU5011,Temperature UP DOWN remote control,24V DC Switch,NC NO sensor control