3.5 overall. Water resistant. Strobe. Impact resistant. Mounts to most handguns. 850 max lumens with 1.75 hour runtime. 245m beam distance. Sharp focused beam. Intuitive switches. Momentary and constant-on operation. Includes: (3) inserts, (2) screws, Allen wrench, and instruction manual. Requires (2) CR123A batteries (included). Aluminum construction. Color: Black. Boxed with hanging tab.