Ade Advanced Optics Strobe 200 Lumen CREE C4 LED Flashlight for Compact Pistols Tactical Super bright 200 Lumen CREE C4 LED bulb The Sliding switch allows you to select Steady on/Strobe modes. Operate with a single CR123 battery(included) With a Quick Detachable Weaver Style Mount, you can quickly install and remove in seconds and mount it onto any of your firearms without tools Perfect Size For Compact Pistols And Also Fits Fullsize Pistols. Can also be used on rifles and shotguns with picatinny/weaver rail systems Can also be used on rifles and shotguns with picatinny/weaver rail systems