The TLR-1s is an intensely bright, durable tactical light that securely fits a broad range of weapons. It also produces a concentrated beam with optimum peripheral illumination. Its housing is constructed of aluminum, Borofloat glass lens, ambidextrous on/off switch and C4 LED bulb. The one handed snap-on/tighten interface keeps hand way form muzzle when attaching/detaching. The TLR-1s mounts directly to handguns with Glock-style rails and to all Picatinny rails. Included are two CR123A lithium batteries and locating keys for use with Glock style, Picatinny, Beretta 90two, S&W 99 and S&W TSW.