At FAS, we have pioneered the application of sensors to control lighting, AC and other functions without manual intervention. We work with the best companies that have invented the sensor technology and gifted it to the world like Hager, Merten, Steinel, etc. Sensors work on multiple technologies like PIR, Ultrasonic, Microwave, etc and we need to select them based on the application, area of coverage, precision of detection, movement of objects in consideration, etc. Sensors are probably the cheapest means to save energy and can be easily deployed without any rewiring requirement.