Using the doppler principle, ultrasonic sensors work by bouncing ultrasonic sound waves off objects in an area and measuring the time it takes for the waves to return. Movement by a person in the area causes the sound waves to return at a changed frequency, resulting in a doppler shift and occupancy detection. These sensors utilize our advanced signal processing circuitry to automatically adjust the signal detection threshold in compensation for changing levels of activity and airflow this helps eliminate false on activations common in other ultrasonic sensors.

WattStopper® Wall Switch Occupancy Sensor, 1-Relay, Series: UW Series, 120/230/277 VAC, 0 to 1200 W, 1/6 hp Power, Ultrasonic Sensor, 300 sq-ft Coverage, 180 deg Viewing, 5 to 30 min Time Delay, Fluorescent/Incandescent/LED Lamp, Flying Lead Connection, Automatic On/Off, Manual On/Off Control Output, Surface Mounting, 35 deg C, Plastic, White, 2.73 in L x 1.76 in W x 1.83 in H Dimensions

• Time delay adjustments - 5 to 30 min at minimum, 3 minimum if no activity after 30 sec at walk through mode, 5 sec for 10 min with DIP switch setting at test mode
• Minimum to maximum (trimpot), Off ultrasonic adjustment
• 0 to 800 W tungsten or ballast, 1/6 hp motor load limit for each relay at 120 VAC and 0 to 1200 W ballast load limit for each relay at 277 VAC
• Complies with 2011 NEC requirements
• Zero crossing for long relay life
• Vandal-resistant lens combines precise coverage with durability
• Selectable walk thorough mode turns lights off 3 min after the room is initially occupied if no motion is detected after the first 30 s
• Test mode allows quick and easy adjustments
• Selectable audible alert for impending shutoff
• LED indicates occupancy detection
• In automatic mode, sensor returns automatically to auto On after lights are turned Off manually, ideal for presentations
• Optional light level sensing with simple setup
• Service mode allows sensor to operate as a service switch in the unlikely event of a failure
• Sensor coverage tested to NEMA guide publication WD 7 to 2000
• Compatible with decorator wallplates
• One relay and one On/Off button
• Magnetic or electronic ballast load type
• Can turn lights Off/On based on occupancy
• It is characterized by high sensitivity to small and large movements

• Specification Sheet https://assets.unilogcorp.com/2/ITEM/DOC/IDW_DOCUMENT_d38a67034b8dd6af532d43943f73b2bb92d6379f73ce9cd65a41c18ba4974463.pdf