The Electronics GEFL Ceiling Mounted PIR Sensor Green-I is a cutting-edge electronic device designed to be installed on the ceiling of a room. It features a Passive Infrared sensor that detects motion and activates the system when someone enters the room. This sensor is ideal for use in various settings where energy efficiency and security are important factors. With its sleek design and advanced technology, the Electronics GEFL Ceiling Mounted PIR Sensor Green-I offers a convenient and effective way to enhance the functionality of any room.