High-performance, recoil-proof LED generates 500 lumens of blinding white light and continues producing tactical-level light (down to 50 lumens) for 1.5 hours Total Internal Reflection (TIR) lens creates intense, versatile beam with enough reach for longer-range applications and significant surround light for peripheral vision Mil-Spec hard-anodized aerospace aluminum, optically coated tempered window, O-ring and gasket seals Shrouded click-type tailcap switch: click-on-off Thumbscrew clamp securely attaches to any MIL-STD-1913 (Picatinny) rail