Constructed from marine-grade aluminum and powder-coated for durability, this solar light is designed to fit conventional 1-1/4" pontoon boat railings. Also excellent for accent lighting on boats and docks as well as non-marine applications. This light features 4 LEDs powered by a 30F capacitor that not only stores energy created from sun exposure, but also charges the NiMH rechargeable battery, so you never have to go without light. Lasts up to 15 hours on a typical charge. 5-lumen output. 4.25"L x 1"W x .75"H.