An occupancy sensor is a lighting control device that detects occupancy of a space by people and turns the lights on or off automatically, using infrared, ultrasonic or Microwave technology. Occupancy sensors are typically used to save energy, provide automatic control, and comply with building codes. Three basics types of occupancy sensors are - ...
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http://en.wikipedia.org/wiki/Occupancy_sensor
An optical, ultrasonic, or infrared sensor that turns room lights on when they detect a person's presence and off after the space is vacated.
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http://www.electromn.com/glossary/o.htm
An optical, ultrasonic, or infrared sensor that turns room lights on when they detect a person's presence and off after the space is vacated.
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https://www.encyclo.co.uk/local/22819
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