Powered by two 3-volt CR123A lithium batteries with 10-year storage life. 300 lumens; 2.5 hours regulated run time; 12,000 candela peak beam intensity. LED technology impervious to shock with a 50,000 hour lifetime. Deep-dish parabolic reflector produces a concentrated beam with optimum peripheral illumination. 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 finish. Ambidextrous momentary/steady on-off switch. Double tap of momentary paddle within 0.4 seconds activates strobe. Highly accurate sight repeatability when remounting. Weight: 4.18 oz. IPX7 rated design; waterproof to 1 meter for 30 minutes. Intensely bright, virtually indestructible, strobing rail-mounted tactical light which attaches to almost any gun in seconds.