The Taylorbrite LED Dock Light is built specifically for the marine environment. These surface-mount solar lights automatically provide 8 hours of bright light each night. Even after a cloudy day. The innovative lens design directs the light at the dock, piling, or post, where it is needed. This also helps for safety and visibility. The dock light also includes a replaceable AA size NiMH battery. Easily switch light output from white to blue or green. The dock light are also waterproof and shock resistant. The post light are also manufactured by Taylor Made Products.