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 320-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. We also make a polymer-body version of this light, the G2X Pro, and a single-output version with a tactical tailcap switch, the 6PX Tactical. 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 SPECIFICATIONS: Output / Runtime -- White Light High: 320.0 lumens / 2.0 hours Low: 15.0 lumens / 45.0 hours Tactical Runtime*: 2.0 hours Length: 5.20 inches Bezel Diameter: 1.25 inches Weight w/Batteries: 5 .2 ounces Batteries: 2 123A (included) *Runtime (at highest setting for multiple-output lights) until output drops below 50 lumens