Feature: Easily charge with built-in USB, plug directly into your laptop, power bank, adapter, car charger or USB socket to charge, no extra cables required. 160mAh Lithium battery, lasts about 6-8 hours on a 0.25 hour charge (under brightness setting). No more wasting money on batteries. 30%, 60%, 100% brightness options allow you to choose the perfect brightness to keep your eyes comfortable and enjoy your 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 your previously selected brightness level. Mini size design, 1.37 oz, compact and lightweight, ideal for clipping to a book for night reading; fully folds flat and slim, making it easy to read in the back seat of a plane, train or car while traveling. 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 the light. This book light can also be used as a bookmark or mini flashlight when turned off. The perfect LED reading light for pocket books, magazines, bedtime stories and more. Gifts for your kids, friends and family. Specification: Material: ABS Housing color: black/white/blue/pink Three light modes: white light, warm light, white light + warm light Brightness level: low 30%/medium 60%/high 100% (three brightness levels for each lighting mode) Battery capacity: Lithium battery 160mAh (4020319l is the battery model) Color temperature: 5500-6000k for white light, 2700-3500k for warm light Lumens: 22-24 Product size: 10.5x4.6x1.3cm/4.13x1.81x0.51in Color box size: 10.8x4.8x1.5cm/4.25x1.89x0.59in Gross weight: about 60 grams Battery life: 6-8 hours in monochrome light mode, about 1 hour in two-color light mode Light source power: 1W 1 x Book Reading Light 1 x Instruction