Installation Secure the power supply to the dock or piling using the provided screws. Attach cord from LED to the power supply. Unravel and straighten LED light cord. Spin LED light to remove any twists/spirals in the cord. Grasp the light and weight and simply toss them in the water at the same time. Plug photocell/timer into a standard 110-120vac receptacle. Plug power supply into the photocell/timer and select dusk to dawn. Sit back, relax, and enjoy your underwater lighting system. The Most Advanced LED Lighting System For Your Dock, Pond, or Pool Advanced Underwater LED Light Made with high quality Cree LED components Energy Efficient Long operating life Low Profile Design for shallow water applications The best entertainment for your waterfront property! Attract a wide varity of marine life Add ambience to your waterway Catch more fish Bait Love this light!