Intensely bright, virtually indestructible tactical light, attaches/detaches to almost any gun in seconds. Powered by two 3-volt CR123 lithium batteries with 10-year storage life.  Shockproof super high-flux LED with blinding beam (up to 80 lumens) with bright side-light ��" will not break or burn out.  Up to 2.5 hrs runtime. 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. Waterproof to one meter for one hour, dustproof. Ambidextrous momentary/steady on/off switch. 4.18 oz.