The NItecore EC4S is a die cast aluminum flashlight designed to be stronger, lighter, and smaller than a traditional flashlight. Advanced Temperature Regulation technology provides superior heat dissipation. The Nitecore EC4S produces 2,150 lumens with a Cree XHP50 LED. It can be powered by either two 18650 lithium-ion rechargeable batteries or four CR123 non-rechargeable lithium batteries. Measuring just 5.91inches long, the Nitecore EC4S is one of the smallest high lumen flashlights available.