3.6 overall. Impact resistant. Water resistant. Weapon mountable. LED. 1000 lumens with 1.25 hour runtime. TIR lens. Integral ambidextrous momentary and constant on switching. Attaches to both Universal and Picatinny accessory rails. Accepts optional pressure-activated DG and XT remote switches for precision control without altering grip on weapon. Requires (2) CR123A batteries (included). Aluminum construction. Color: Black. Boxed with hanging tab.