The Innovative LightingA(R) stern light uses 90% less energy than incandescent bulbs and features removable lamp carriage assembly. Features. Shock-resistant neoprene accents. 100,000 hours LED service life. Uses 90% less energy than incandescent bulbs. Insert molded brass threaded mounting bushings. Removable lamp carriage assembly. Fully buoyant. 1 LED. Requires 4 AA batteries (not included).