Browning's Stoke is a product of amazing evolution in LED and rechargeable battery technology. It provides you with incredibly high light output or long-lasting continuous runtime in the same package. The aluminum housing makes it touch and lightweight, and it helps to keep the light cool, while the adjustable bezel allows you to focus the beam to your needs. Best of all, it can use either a high-performance USB rechargeable battery (USB charger is built into the light) or standard single use CR123A batteries. The Dual Fuel is a design concept that allows lights to run off of rechargeable or standard single use batteries, increasing the capability of your lights and giving you the best of both worlds.