Marine Hidden Horn - White with Stainless Steel OverlayFeatures:12 or 24 Volt DC SystemsFor vessels under 12M (39.4)Uses "SETS" Horn TechnologyDraws less than 1/2 AmpUnit is Polarity ProtectedSolid state with no moving partsBuilt-in water evacuation drainage systemRequires 2-1/4" holeMounting gasket included