C4® LED technology, with a 50,000 hour lifetime.Unbreakable and scratch resistant polycarbonate lens.Up to 683 candela peak beam intensity, 28 lumens typical, 2.25 hours runtime.One "AAA" alkaline battery.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. High Strength "Break Away" safety lanyard. Unbreakable pocket clip.L x D: 3.5" x .6" (90 x 15 mm)1.04 oz (29.7 g)Matte Black