2.58″ overall. Water resistant. Impact resistant. Weight: 2.4oz. For full-size and compact railed handguns. FLEX Rear switch model. Custom optic produces a narrow beam with optimum peripheral illumination. 500 lumens. 1.5 hour runtime. 140m beam distance. Key kit (included) to securely fit a broad range of weapons. Rail clamp system securely attaches/detaches quickly with no tools. Safe-Off feature prevents accidental activation. Requires (1) CR123A battery (included). Aluminum construction. Color: Black. Boxed with hanging tab.