The Legrand Wattstopper CI-300 Ceiling Occupancy Sensor is a passive infrared sensor designed to detect occupancy in a room. With a voltage range of 120-277V, this sensor is compatible with standard electrical systems. The Legrand brand ensures quality and reliability, while the smart home protocol of infrared allows for easy integration into existing systems. Perfect for home improvement projects, this occupancy sensor from Legrand offers energy savings by automatically adjusting lighting levels based on occupancy.