Streamlight's TLR-1 is an intensely bright, durable tactical light which securely fits a broad range of weapons. It produces a concentrated beam with optimum peripheral illumination. The housing body is constructed of machined aluminum with an anodized finish, Boro Float glass lens, and a high power IR LED impervious to shock. The TLR-1 features ambidextrous switch and one handed snap-on/tighten interface. It includes two CR123A lithium batteries, rail locating Keys for use with Glock style, 1913 Picatinny, S&W 99/TSW, and Beretta 90two.