The LOS-CDT series ceiling mount sensor offers a combination of both Ultrasonic and Passive Infared technologies. Ultrasonic sensors provide excellent detection of minor motions, such as typing at the keyboard. Passive Infrared sensors provide false tripping immunity and are better suited for major motion, such as walking. This Dual Technology Sensor provides 360 degree coverage up to 2000 sq ft. 20-24VDC. White Only.