Dock Edge Solar Post Light. Powerful solar charging performance. 6 possible colors to choose from. Change colors with a flip of a switch. Easy twist-on lid with large rubber seal. 360 degree lenticular light diffusing lens and domed reflector maximize light output. Installs easily with no wires. Patent pending universal fittings or 1-5/8", 1-7/8", 2-3/8", Brock Post and 3-1/4" ID posts, universal flat surfaces.