SureFire M300B-Z68-BK Mini Scout Light LED WeaponLight (Tailcap Switch Only) High-performance, recoil-proof LED generates 200 lumens of blinding white light and continues producing tactical-level light for 1.3 hours Total Internal Reflection (TIR) lens creates versatile beam with enough reach for medium-range applications and sufficient surround light for peripheral vision Construction: Mil-Spec hard-anodized aerospace aluminum, optically coated tempered window, O-ring and gasket seals Shrouded click-type tailcap switch: click-on or off Thumbscrew clamp securely attaches to any MIL-STD-1913 (Picatinny) rail