Simple to Install and Maintain! Deep Glow lights are designed to be easily installed in just minutes without getting wet. Simply screw the ballast (grey box) to the dock adjacent to your GFCI outlet and drop or throw the light in the water at the desired location. The light will automatically right itself and land on the bottom facing the surface. Plug the cord into the timer (optional) and plug the timer into your outlet. When the sun goes down, the fun will start! Removing the lights for storage or cleaning is just as easy. The light can be cleaned with a scrub brush and returned to the water.