Energizer Ultimate Lithium Flashlight One CREE LED provides 70 lumens maximum brightness. Advanced circuitry allows for variable brightness control from the pushbutton tail switch when used with a 1AA Energizer Ultimate Lithium Battery Light beams reach a distance of 56 Meters Pulse-width modulation maximizes battery life. Also features automatic shut-off at 30 minutes if light is accidently activated Machined aircraft aluminum casing makes for a compact, attractive design that is rugged and waterproof; exceptional cold weather performance Run time of 2 hours and 45 minutes powered by 1AA Energizer Ultimate Lithium batteries (included)