The Lutron Maestro occupancy sensor switch combines a Maestro switch with a passive infrared occupancy or vacancy sensor. The sensor detects the heat from occupants moving within an area to determine whether the space is occupied. Based on the feedback from the sensor, the occupancy sensor switch will adjust the load accordingly. Passive infrared sensors with exclusive Lutron XCT Technology for fine motion detection Standard zero cross maximizes relay life by switching at the point of minimum energy on the AC power curve Adaptive zero cross maximizes relay life by switching at the point of minimum energy on the AC power curve Actively adapts to variations in relay timing