Intermatic IOS-CMP-DT-U Line Voltage Ceiling Mount Dual Tech Sensor Ultrasonic and Passive Infrared (PIR) sensing improves presence detection while avoiding false triggers, even in areas with partitions and/or small movements Zero-crossing technology for long life and performance Coverage: 360-degree, 1600 square feet PIR, 1000 square feet ultrasonic, mounted on 8 to 11 foot ceiling Adjustable ambient light sensor override Requires neutral connection