The Streamlight TLR-1S Gun Light 69210 is a rail-mounted LED strobing tactical light. Its sealed aluminum IPX7 rated construction makes it waterproof to 1 meter for 30 minutes and virtually indestructible. Quickly attaches/detaches to handguns with Glock-style rails and to all MIL-STD-1913 (Picatinny) rails. Includes two CR123A lithium batteries.