Streamlight Double Clutch USB Headlamp Compact, extremely light weight, high performance USB rechargeable LED headlamp. The Double Clutch USB headlamp offers "Dual Fuel" technology and one handed glove-friendly facecap rotation to operate the light. The headlamp additionally offers spot or flood beam and high or low lighting modes. The Lithium Polymer battery charges inside or outside of the headlamp or three AAA sized batteries can be used for disposable power. The Double Clutch USB headlamp has been specifically engineered to maximize run time and minimize weight with a low profile design and an optimized center of gravity providing maximum wearer comfort and stability during use. The headlamp is packaged with an elastic head strap and rubber helmet strap. Rechargeable and alkaline models available. Features: Compact and lightweight High performance rechargeable Highly versatile headlamp with both spot and flood beams, high and low modes, and two battery options Use the spot beam for distance lighting and the flood beam for work at arm's length - a quick twist of the facecap makes the change Powered by USB rechargeable lithium polymer battery; also accepts 3 AAA alkaline or lithium batteries as back-up