Enerlites MDC-50L Ceiling Sensor Commercial Grade Ultrasonic/Passive Infrared 360 Degree FOV, Low Voltage, White Combines passive infrared and ultrasonic technology providing the most accurate motion ceiling sensor possible Low voltage provides energy efficient solution saving money without sacrificing performance 6 different trigger modes and adjustable time delay via dip switch (5 sec - 30 min) Multi-level Coverage up to 1, 600 ft. *Enerlites MPP-24 power pack required!* Ul/ CUL Listed. Operating temperature (32  131F); California Title 24 compliant