Low voltage infrared ceiling sensor for use with PP-20 power supply. •Must use with PP-20 power pack. •360 degree coverage, 20 foot diameter. •Multiple sensors can be controlled by same power pack for coverage of large areas. •Adjustable time delay from 30 seconds to 20 minutes. •5 year warranty. Made in U.S.A. •Green L.E.D. indicator light. •Mounts directly to ceiling tiles, no box needed. •3.9 inch diameter, 1.34 inches deep.