CALL FOR PRICING. The SureFire G2 flashlight is powered by two lithium batteries (10-year shelf life) and made of Nitrolon, a proprietary polymer compound that is lightweight, corrosion-proof and non-conductive. A molded-in gridlock pattern allows for a sure grip in any weather, and although three to four times brighter than a typical 2-D cell flashlight this lightweight powerhouse is less than five inches long; making it ideal when space is at a premium and weight is an issue. The G2 features unique switching originally developed for law enforcement - twist for constant on, or depress the tailcap button for momentary illumination or emergency signaling.