High-intensity light beam. 1/2 turn, twist focus, spot-to-flood. Interchangeable light sourcing-use either the installed LED module or the Krypton lamp (stored in tailcap). High-strength aluminum alloy case. O-ring sealed for water resistance. Vented tailcap reduces chance of gas buildup. Compact, lightweight construction. Limited lifetme warranty in the Western Hemisphere and Japan. 10-year limited warranty elsewhere. All Mag flashlights are designed, patented, and manufactured in the U.S.A. May contain some imported components. Requires 2 "D" batteries, not included.