Battery Navigation Light: Requires 4 AA batteries (not included), Molded one piece body construction, Shock resistant neoprene accents, Incandescent or LED available, Rated at 100,000 hours LED service life, LED uses 90% less energy than incandescent, Sealed heavy duty on/off switch, Insert molded brass threaded mountnig bushings, Removable lamp carriage assembly, 6.18" x 2.53", Mounting Style: Suction Cup.