2.5'' overall. Water resistant. Impact resistant. Weapon mountable. Fits full size and compact handguns. Daylight visible green laser. Battery safe mode. Ambidextrous, intuitive operation. 550 lumens. 2 hour, 30 minute runtime. 136m beam distance. Includes: (5) Rail inserts, (2) Spare screws, Allen wrench, and instruction manual. Requires (2) CR123A batteries (included). Aluminum construction. Color: Black. Boxed with hanging tab.