Occupancy sensors were fully automatic, turning the lights on when someone entered the room and turning them off after they left. For areas where there is a significant amount of light from natural daylight or from spillover from adjacent areas, this can be wasteful as the sensor may be turning the lights on when the occupants might have chosen to leave them off. “Off only” occupancy sensors, also known as vacancy sensors. The device is UL Listed and conforms to California Title 24 Requirements.