... a very simple device which can be used for authorized door access, controlling gates, switching of remote equipments, car parking ... ; 16. Unmanned machine rooms;17. Control room application;18. Automation System, M2M;19. GSM Access Control System, GSM Gate Opener, etc. ... Oil Overflow Level Sensor, Water Leak Sensor, Temperature Sensor, Door Sensor, PIR Motion Sensor, Smoke Sensor, Gas Leak Sensor, ...