Suction Cup Mount L.E.D. Advantage means low power draw, batteries last longer than standard incandescent bulbs. Easy to store. Compact size takes up less space on deck. Certified USCG 2nm, for use on boats under 23′ (7 meters) with a maximum speed of 7 knots (8 MPH). One piece molded suction cup sticks and stays put. Requires (3) “AAA” Batteries (Not included).