The 6PX Pro's high-efficiency LED provides two light output levels, a brilliant, penetrating, perfectly pre-focused 600-lumen beam and a 15-lumen low-output setting that lets you 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.