The headlamp flashlight uses class-leading LED chips that has the maximum brightness of 1100 lumens, easily light up an entire tent and road. It has powerful 1500mAh built-in rechargeable battery, which can be able to charge and turn on the lights at the same time. No need to wait for full charge or replace the battery. And the battery indicator will help you master battery usage. ( Last for 4-10 hours when fully charged. ). The hand-free headlamp is only weight 1. 87 OZ, comfortable and lightweight. The lamp head can be rotated 60° and tightly fixed to avoid shaking and sliding when running. The head flashlight uses comfortable elastic headband, which can easily adjust the length to perfectly fit your head size, perfect for adults and kids.