Long Lasting USB Rechargeable & 6-80 Hours Working Time: Built-in 1000mAh large capacity rechargeable battery to provide you with brighter and longer light. After fully charged, it will last 7-13 hours in general reading level and up to 80 hours in the lowest brightness. Long working time for your freedom. It can also be charged via the USB charging cable to ensure its normal use. 3 Lighting Colors & Adjustable Brightness: Each reading light cap has an independent sensor switch. Long press can adjust the brightness and short press can change the light color. There are 3 colors for you to choose from for different situations, moods and feelings. Hands-Free Neck Wear: Unlike previous reading lights, our neck light does not require a flat desk, no hand-held act and no trouble finding a socket for charging. Our neck light can be used easily and conveniently only by wearing it around your neck. And the brightness and color of the light can be adjusted, which not only better protects the