Leviton OSC20-U0W Ceiling Mount Occupancy Sensor, Ultrasonic, 360 Degree, 2000 sq. ft. Coverage, Self-Adjusting, White Installed sensor appears almost invisible Easy ceiling mount, three wire connection (low voltage) and twist-lock sensor attachment All digital circuitry uses a minimum of components The ultrasonic technology provides excellent small motion sensitivity Learned and adjusted settings saved in protected memory are not lost during power outages