Intensely bright, virtually indestructible tactical light. Includes user programable strobe enable/disable. - Powered by two 3-volt CR123A lithium batteries with 10-year storage life - C4 LED with blinding beam (TLR-1s 300 lumens) with optimum peripheral illumination will not break or burn out! - Strobe model with user programmable strobe enable/disable - Up to 2.5 hr. Run Time - Rail grip clamp system securely attaches/detaches quickly and safely with no tools and without putting your hands in front of muzzle - Machined aluminum sealed construction with black anodized finish - Waterproof to one meter for one hour, dustproof - Ambidextrous momentary/steady on-off switch, Double tap of momentary paddle within 0.4 seconds activates strobe. (TLR-1s only) - Fast, adjustable, secure side mounting. Includes Rail Locating Keys for Glock style, 1913 Picatinny, S&W 99/TSW, and Beretta 90two - IPX7 rated design waterproof to 1 meter for 30 minutes - Weight: 4.18 oz.