Solar Dock-Post Lite4X brighter and longer lasting than solar garden lights, the Solar Dock Lite v5 is a great way to light up your dock or pier. During the day the solar panel collects the sun's energy and charges the batteries. At nightfall, Solar Dock Lite's sensor automatically turn on the super bright LED. With multiple units your dock will provide an elegantly lit pathway for all to walk on. This unit is hands free and energy efficient! Lasts 18+ hours on a full