Energizer Ultimate Lithium 1 LED Hand Held Light, Gray, 4AAA One CREE LED provides 90 lumens maximum brightness. Advanced circuitry allows for variable brightness control from the pushbutton tail switch. Machines aircraft aluminum casing Pulse-width mudulation maximizes battery life. Also features automatic shut-off at 30 minutes if light is accidently activated Compact, attractive design is rugged and waterproof Lifetime Guarantee. Four Energizer Ultimate Lithium 4- AAA batteries are included.