An intensely bright 5000 Lumen 120 degree LED assembly in a Sartek 3-C cell Aluminum Housing, depth rated to 1000', up to a 100,000+ hour lamp life. Burn time on C cells is 1-2 hours and on rechargeable 26650 lithium cells 3-4 hours at full output . This is the toughest light you'll ever own. This system gives you the choice of using Alkaline, Lithium Ion or NiMH batteries, as your lighting needs change. The body is machined from a solid rod of aluminum. Lifetime warranty against material and workmanship defects.