Aerospace aluminum, Mil-Spec hard-anodized; polycarbonate window Virtually indestructible LED emitter regulated to maximize output and runtime Two output levels: High for maximum light, Low for extended runtime Precision micro-textured reflector creates a smooth, optimized beam High-strength aerospace aluminum body, hard anodized for extreme durability Weatherproof O-ring and gasket sealing Dual-output tailcap click switch- press or click for low, return to off then press or click again for high