EASY TO RECHARGE: This beanie hat has a rechargeable LED light and a 3.7V lithium battery with easy USB charging. POWERFUL LIGHT OUTPUT: With 60 Lumen light output, it has three lighting modes: 100%, 75% and 50%. VERSATILE: One size fits all, the beanie is ideal for hands free use when undertaking repairs, inspection work, dog walking, camping, DIY and other activities.