Streamlight Tactical Light with Integrated Red Aiming Laser - 300 lumens and 2.5 hours runtime Powered by two 3-volt CR123 lithium batteries Rail grip clamp system securely attaches quickly and safely with no tools LASER ONLY runs 48 hours. Rail grip clamp system securely attaches/detaches quickly and safely with no tools and without putting your hands in front of muzzle Fast, Adjustable, Secure Side mounting to 1913 and Glock style Rails Machined aluminum sealed construction with black anodized finish IPX4 rated for water resistance Ambidextrous momentary/steady on/off switch Highly accurate sight repeatability when remounting Fits existing light bearing holsters Includes keys for Glock-style, Picatinny, Beretta 90two, S&W 99, S&W TSW and Sig P320 rails