http://tinyurl.com/p84sl7jStreamlight TLR-1 IR Rail-Mounted Infrared Weapon 135 Lumen Light, Black 69150Product Review Click on the link for more reviewsHigh Power IR LED technologyPowered by two 3-volt CR123 lithium batteries with 10-year storage lifeRail grip clamp system securely attaches/detaches quickly and safely with no tools and without putting your hands in front of muzzleMounts directly to handguns with Glock-style rails and to all MIL-STD-1913 (Picatinny) railsIncludes keys for Glock-style, Picatinny, Beretta 90two, S&W 99 and S&W TSW