Leviton OSSMT-MDR Multi-Technology PIR/Ultrasonic Wall Switch Occupancy Sensor, Red Provide automatic lighting control for energy savings and convenience in a variety of commercial applications Fast, simple Installation - fits in a standard wall box and replaces a single-pole wall-switch, neutral and no neutral options available. Convenient Pushbutton provides manual-ON/OFF light switching at any time Exclusive Walk-through Feature provides increased energy savings by not leaving the lights ON for an extended period after only momentary occupancy. Small Motion Sensitivity (U/S) - ultrasonic technology provides excellent minor motion sensitivity.