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 tail cap 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. Surefire also makes a polymer-body version of this light" the G2X Pro" and a single-output version with a tactical tail cap switch" the 6PX Tactical.