The Streamlight 69211 TLR-1s is a lightweight, compact, lithium battery powered gun-mounted tactical light featuring the latest in shock-proof power LED technology and providing at least 25-hours of continuous run time Its rail clamp is designed to rapidly attach/detach from the side of a weapon without the use of tools A tethered battery door and latch mechanism prevents battery door loss while providing easy battery replacement When enabled, strobe can be activated on two or more momentary paddle hits