opsmen fast 301r weapon light for picatinny rail 800 lumen: The one-battery Fast 301 Tactical Flashlight is the smallest, lightest and powerful single-output Tactical-Light, designed for EDC and hardcore tactical situations. With a simple but reliable one brightness mode only, can reach a maximum of 800 lumens with bright light. Powerful output and extensive runtime enables you to get the job done. 301 model integral thumbscrew clamp can attaches to any picatinny rail, literally become a part of your guns. Come with extra remote switches.