... GSM Controller RTU5010 with 4 I/O ports, without AD inputs, Microphone and Speaker. The other functions ... GSM Network. This is very useful to street light control, wellhead control, BTS environment monitoring, ... Sensor, Oil Overflow Level Sensor, Water Leak Sensor, Temperature Sensor, Door Sensor, PIR Motion Sensor, Smoke Sensor, Gas Leak Sensor, Glass Break Sensor, Shock Sensor, Power failure sensor ...