C4® LED technology, with a 50,000 hour lifetime. Unbreakable and scratch resistant polycarbonate lens. C4® LED (white): 1,033 candela peak beam intensity; 48 lumens measured system output; 6.25 hours runtime. Powered by two (2) “AAA” alkaline batteries (included). Push button tail switch - momentary or constant on operation. Tailcap switch for momentary on/off. O-ring sealed, shock proof and drop-tested construction. Water resistant per IPX4; in accordance with specification EN 60529:1992. Tear resistant nylon holster. Unbreakable pocket clip. Length x Diameter: 5.3” x .6” (134 x 15mm). Weighs: 1.64 oz. with battery.