Tailcap switch. Water resistant. Impact resistant. Strobe. Weight: 2.74oz. For long guns. Integrated rail clamp attaches to MIL-STD-1913 rails. Ambidextrous operation. Safe off feature. 500 max lumens. 140m beam distance. Requires (1) CR123A battery (included). Aluminum construction. Color: Black. Boxed with hanging tab.