Powered by two 3-volt CR123 lithium batteries with 10-year storage life C4® LED technology, impervious to shock with a 50,000 hour lifetime LED Rating: Up to 7,000 candela peak beam intensity and up to 135 lumens measured system output. Deep-dish parabolic reflector produces a concentrated beam with optimum peripheral illumination Run Time: 2.5 hours regulated run time. Solid-state current regulation for consistent illumination level. Rail grip clamp system securely attaches/detaches quickly and safely with no tools and without putting your hands in front of muzzle Mounts directly to handguns with Glock-style rails and to all MIL-STD-1913 (Picatinny) rails. Includes keys for Glock-style, Picatinny, Beretta 90two, S&W 99 and S&W TSW Machined aluminum sealed construction with black anodized finsih Ambidextrous momentary/steady on/off switch Highly accurate sight repeatability when remounting Fits existing light bearing holsters 4.18 oz. Lithium Battery Notice under TECH DOCS IPX7 rated design; waterproof to 1 meter for 30 minutes. Dustproof.