the book reading light have no additional cables or batteries needed, easily Charged with built-in USB, directly plug it into your computer, power bank, adapter, car charger, or USB outlet for recharging. 1.5 hours to charge and it will lasts up to 8 hours(at brightest setting). the book reading light can be also used as a bookmark, or mini flashlight when power blackout. Perfect LED reading light for paperback books, magazines, bedtime stories etc. Great for your kids, friends and family.