4.5” overall. Weapon mountable. Tailcap switch. Water resistant. Impact resistant. Strobe. Weight: 4.55oz. Fits long guns with MIL-STD-1913 rails. Safe off feature. Integrated rail clamp. Ambidextrous operation. Easy to attach, secure mounting. 1000 max lumens with 1.5 hour runtime. 200m beam distance. Requires (2) CR123A batteries (included). Aluminum construction.Includes rail locating keys. Color: Black. Boxed with hanging tab.