2-mile, 360, visibility. USCG certified for use on boats up up to 39.4′ (12m). Exclusive anti-glare design preserves night vision. Over 50;000 hour life. Articulating head for use in all applications. Includes a black composite LightArmor&trade, fold-down base that provides easy, single-handed cam-lock operation. Bases install with required #10 fasteners. Also includes rail mount adapter (#91367). 10 year warranty.