USCG certified for use on vessels 20 meters (65.6 ft.) to 50 meters (164 ft.) in length. 2 mile visibility. UL listed. Black plastic construction. Pre-wired double contact socket and 3 feet of 16/3-SO cable. For 12, 24, 32 or 120 volts. Bulb not included. Watertight access cap for rebulbing and cleaning. Overall height 7-1/2", lens height 4-1/2". Screw size 1/4". Replacement bulbs: Special order only.