The TWM-852XL Tactical Weapon-Mounted Long Gun Light uses an LED rated 850 lumens for 1.75 hours providing a beam distance of 245 meters. The rear-facing single switch provides both momentary and constant-on lighting operation. Designed to securely attach to a long gun Picatinny rail, the IP-X7 rated waterproof housing is constructed from aircraft-grade 6061-T6 aluminum.Features :LED technologySingle switch functionalityMomentary or constant-on flashlightSharp focused beam for distance illuminationLight comes pre-installed with 1 set (2) cross-rail insertsAircraft-grade 6061-T6 aluminum housingType III hard anodized finish