A WAC Lighting photosensor (photodetector) used to detect light and infrared electromagnetic energy in the surrounding environment. Plugs into the Landscape Lighting Transformer (see related items) to provide luminance in the absence of natural UV light during the darker hours of the day. Automatically shuts down when light reappears. Use the remote option with cord when power supply is installed in an area removed from sunlight. May be used in dry or wet locations.