Details: The Ultra's patented LED Step-up Regulator technology provides superior luminosity, blinding 30 foot beam, and up to 100 hours burn time from one AA battery (included). Compact, indestructible anodized aluminum construction with epoxy coated circuit for extra durability and two o-rings for waterproof seal to 10 feet. Includes lanyard and clip for hands free use. Size 3.25". Weight 2.0 oz. Limited Lifetime Warranty.