Hubbell Building Automation OMNIDT2000 Digital Passive Infrared and Ultrasonic Ceiling Occupancy Sensor, 2000-Square-foot Range Combines both ultrasonic (US) and passive infrared (PIR) technologies for unequaled occupancy detection and false trip immunity Optional relay control for use with building automation systems and a photo sensor for automatic daylight harvesting IntellADAPT provides true maintenance free "Install and forget" operation 2000-Square Foot range Dimensions: 4.2 x 1.8 x 2.1-Inch