NK-DR-103-04 receptacle for luminaires,UL & C-UL recognized. Automatically turns light on at dusk and off at dawn.It could be applied to various of photocell sensors and adjustable light function. It's suitable for parking lot, street lighting, outdoor lighting, factory, indoor lighting, pedestrian pathway and landscape lighting etc. Twist lock design makes it easy to replace and install. The casing is made from high quality polycarbonate, which are corrosion preventive and waterproof to ensure longer life.