6 Preinstalled LED colors allow you to change colors any time with a built-in color changing switch. Piling cap lights automatically come on at dusk, turn off at dawn, and provide 360 illumination for docking your boat or just dock safety at night. They are completely waterproof, made of durable UV resistant ABS and have a wildlife deterrent spike on top so they will look good for years. Installs easily in minutes and includes a rechargeable AAA Ni-Cad battery. Piling cap not included.