The LOS-SUS series wall switch sensor offers only Ultrasonic Technology. These switches offer a direct quick replacement of wall switches for stand alone line voltage switching of small spaces. 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 180 degree coverage up to 1000 sq ft. 20-24VDC.