USCG certified for use on power driven vessels under 12 meters (39.4 ft). length. 1 mile visibility. USCG, ABYC, NMMA Certified.. Black plastic top. 3/4" dia. anodized aluminum tube. 12V bulb included. Requires 2 pin mounting base. Ideal for boats with casting decks on the bow. Can be unplugged and stowed while fishing. This leaves only a small, flat topped base.