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 (1) “AAA” alkaline battery (included). Features push button tail switch with momentary or constant on operation, 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. Dimensions: 3.5”Length x 0.6” Diameter. Weight: 1.04 oz.