The RailLight Premium is brighter and larger than the RailLight Mini. It has four LEDs for twice the light and a waterproof switch with two brightness settings. The FastSolar technology quickly charges in various lighting conditions for up to eight hours of light on a full charge. Marine-grade stainless steel, UV-proof lens, and sealed electronics mean the RailLight Premium is built to last. Three QuickMount attachment options mount the light to any railing, coaming, bulkhead, stanchion, step, ladder, piling or dock box. Single 1800mAh rechargeable and replaceable NiMH battery included. 5 1/2"dia. x 14"H. One-year warranty.