Lightweight, compact, lithium battery powered the TLR-1s Gun-Mounted Tactical Light features the latest in shock-proof power LED technology and providing at least 2.5 hours of continuous run time. Rail clamp designed to rapidly attach/detach from side of weapon. Tethered battery door and latch mechanism prevents battery door loss while providing easy battery replacement. When enabled, strobe activated on two or more momentary paddle hits (TLR-1s only). Included are two CR123A lithium batteries and locating keys for use with Glock style, Picatinny, Beretta 90two, S&W 99 and S&W TSW.