The same great features as the TLR-2, now with strobe function! - Powered by two 3-volt CR123A lithium batteries with 10-year storage life - C4 LED with blinding beam (TLR-2s 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 (laser-only mode runs 45+ hrs.) - 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 - Dustproof - Ambidextrous momentary/steady on-off switch, Double tap of momentary paddle within 0.4 seconds activates strobe. (TLR-2s only) - Highly accurate sight repeatability when remounting - Fast, adjustable, secure side mounting. Includes Rail Locating Keys for Glock style, 1913 Picatinny, S&W 99/TSW, and Beretta 90two - IPX4 rated design for water resistant operation - Weight: 4.72 oz.