The Double Clutch USB gives you the flexibility of shifting between beams and modes to fit your task, as well as choosing your battery source. It is also easy to use, even with gloves just a quick twist of the face cap turns the light on and off, or changes the output from spot to flood. C4 LED with spot and flood beams. Spot use for long distances and flood beam for work at arms length. It is water resistant and 2 meter impact resistant tested. Includes USB cord, and adjustable elastic hard straps; optional AC wall adapter purchased separately. The headlamp will operate on 3 AAA batteries aside from its rechargeable lithium battery.