... The GSM SMS Controller-Alarm suitable for below applications:1. Security Alarm System applications; 2. Supervision and monitoring alarm systems;3. Automatic monitoring system; 4. Vending Machines ... 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 ...