The TWM-854XL Tactical Weapon-Mounted Long Gun Light with Remote Pressure Switch uses an LED rated 850 lumens. Working in conjunction with a high-efficiency deep parabolic reflector it creates a usable beam of light rated at 245 meters. This weapon light attaches to a Picatinny Rail of a long gun to operate the momentary-on or constant-on lighting modes.Features :LED technologyRemote Pressure SwitchMomentary or constant-on flashlightSharp focused beam for distance illuminationAircraft-grade 6061-T6 aluminum housingGlass-filled nylon polymer toggle switchType III hard anodized finish