Using both ultrasonic and PIR (passive infrared) motion sensing technology, this Lutron Maestro MS-A202-WH dual circuit switch will detect very fine motion, such as typing, prompting lights to automatically turn on and remain on while a room is occupied. It will automatically turns the lights off when movement has ceased. The white-finished Maestro occupancy switch also features adaptive relay switching, smart ambient light detection, simple button presses for dual-circuit custom settings, and meets multi-level lighting controls requirements.