The g50 focusing led torch features a twist focus using coasts pure beam focusing optic system providing superior beam consistency from spot to flood with no dark rings typically associated with focusing torches a lightweight aluminum casing offers great durability and will hold up to heavy daily use tested and rated to ansifl1 standards by an independent laboratory pure beam focusing optic twist focus166 lumen output7 hour runtime143 meter 469 ft beam distance3 x aaa batteries included aluminum