The 6PX Pro's high-efficiency LED virtually immune to failure since there's no filament to burn out or break provides two light output levels: a brilliant, penetrating, perfectly pre-focused 600-lumen beam, and a 15-lumen low-output setting that lets you greatly extend the runtime per set of batteries, an invaluable option when you find yourself miles from civilization. Press the tailcap switch for momentary-on low, press further to click constant-on low, return to off and press or click on again within two seconds for high. The high-strength aerospace aluminum body is smoothly sculpted for a comfortable, secure grip and is hard anodized to military specifications for extreme resistance to scratches, abrasion, and corrosion. A polycarbonate micro-textured reflector delivers a comparatively wider beam with generous peripheral light. Product Features Virtually indestructible LED emitter regulated to maximize light output and runtime Two output levels high for maximum light, low for extended runtime Precision micro-textured reflector creates smooth, optimized beam Tough polycarbonate window resists impact High-strength aerospace aluminum body, Mil-Spec hard-anodized for extreme durability Dual-output tailcap click switch press for momentary-on low, click for constant-on low, return to off then press or click again for high Weatherproof O-ring and gasket sealed Includes high-energy 123A batteries with 10-year shelf life