The G2X Pro is a compact yet powerful polymer-body flashlight that uses a high-efficiency LED-virtually immune to failure since there’s no filament to burn out or break-to provide 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 tough Nitrolon polymer body is smoothly sculpted for a comfortable, secure g Mfg: Surefire Specs: High: 320 Lumens Low: 15 Lumens Tactical Runtime: 2 Hours Length: 5.2" Bezel Diameter: 1.25" Weight w/ batteries: 4.4 oz. Batteries: (2) 123A (Included)