characteristic:Easily charge with the built-in USB, plug directly into your laptop, power bank, adapter, car charger or USB outlet to charge without extra cables. 160mAh lithium battery, charge about 8-8 hours (on brightness setting), last 0.25 hours. Stop wasting money on batteries.30%, 60%, and 100% brightness options let you choose the perfect brightness to keep your eyes comfortable and enjoy reading time in bed without disturbing your roommates. Short press to change the brightness, long press to turn off the book light. Brightness memory function, it will keep the brightness level you selected before.Mini size, 1.37oz, is compact and lightweight, perfect for clipping onto a book for nighttime reading; folds completely flat and slim for easy reading in the back seat of an airplane, train or car.Fully flexible design, the LED lens can be rotated 90 left and right horizontally and 45 downward; the 315 flexible stand can be bent to any angle for optimal viewing without constantly changing light.This reading light can also be used as a bookmark or mini flashlight when turned off. The perfect LED reading light for paperbacks, magazines, bedtime stories and more. Great gift idea for your kids, friends and family.Specification:Material: ABS Shell color: black Three lighting modes: white light, warm light, white light + warm light Brightness level: low 30% / medium 60% / high 100% (three levels of brightness for each lighting mode) Battery capacity: 160mAh lithium battery (4020319l is the battery model) Color temperature: white light 5500-6000k, warm light 2700-3500k Lumen : 22-24 Product size: 10.5 x 4.6 x 1.3cm/4.13 x 1.81 x 0.51inch Color box size: 10.8 x 4.8 x 1.5cm/4.25 x 1.89 x 0.59 inch Gross weight: about 60 grams Battery life: 6-8 hours in monochromatic light mode, about 1 hour in bi-color light mode Power of the light source: 1W Notice:Due to the different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture. THANKSDue to manual measurement, please allow 1-2cm measurement deviation.