... GSM Controller RTU5010/RTU5011:>>UP TO 8 NC/NO inputs, connect dry contact NC NO device>>UP TO 8 Relay outputs ... Overflow Level 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, etc ...