Recess-mounting Bracket For Radio Powr Savr Ceiling SensorLutrons ceiling mounted occupancy vacancy sensors are wireless, battery powered passive infrared (PIR) sensors that automatically control lights via RF communication to compatible dimming and switching devices. These sensors detect the heat from people moving within an area to determine when the space is occupied. The sensors then wirelessly transmit the appropriate commands to the associated dimming and switching devices to turn the lights on or off