Streamlight TLR-1 Weapon Mount Tactical Light. Features a shockproof 3 watt Luxeon LED light, up to 2.5 hours runtime, machined aluminum body, ambidextrous momentary/steady on-off switch. Fits existing light bearing holsters. C4 LED technology, ambidextrous momentary/steady On-Off switch. One handed snap-on and tighten interface keeps hands away from muzzle when attaching/detaching. Securely fits a broad range of weapons. 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. Extensively live-fire tested impact resistant construction. Operating temperature: -40 degreeF to +120 degreeF. IPX7 rated design; waterproof to 1 meter for 30 minutes. Mil-Spec 810F, Performance tested. IR model available with high power IR 850 nm LED, compatible with most night vision equipment. Case Material: Machined aluminum construction with anodized finish. Length: 3.26 in. Width: 1.47 in. Height: 1.44 in. Weight: 4.18 oz (118.6 grams)with batteries. Lens: High temperature, shock mounted, impact resistant, Boro Float Glass lens. Light Source: C4 LED technology, impervious to shock with a 50,000 hour lifetime. Light Output: Up to 7,000 candela (peak beam intensity); 135 lumens. Deep-dish parabolic reflector produces a concentrated beam. With optimum peripheral illumination. On/Off: Ambidextrous momentary/steady On-Off switch. Run Time: 2.5 hours regulated run time. Solid-state current regulation for consistent illumination level. Battery: Two (2) 3V CR123A lithium.