... , Microphone and Speaker . The GSM Controller RTU5010 with 4 I/O ports, without AD inputs, Microphone ... switch which can be activated automatically. A relay with dialling-in remote control. An automation system. A ... , 0-53mA, 10 precision(RTU5011)>>Reliable performance with built-in double watchdog>>Automatic device condition report ... ,Temperature UP DOWN remote control,24V DC Switch,NC NO sensor control