Designed for boats that are manually powered or with speeds up to 7 knots. Housing: High quality shock resistant black neoprene, watertight, buoyant, shock resistant; sealed heavy duty on off switch. Optics: Uses premium side emitting luxeon super 1W LED bulb. Clear or bi color special plastic projector, seawater resistant. Uses four (4) "AA" cell batteries (not included). LED extends battery life up to 10 times vs incandescent. All round white, stern. Lights are available with various mounting options for stern and bow. Mounting options include C clamp or suction cup, inflatable, or U bracket (for stern light with 24" pole only).