Eye Care Amber Glow1800K color temperature, the upgrade amber book light blocks 99.95% blue light, will not stimulate your photoreceptors or disrupt circadian rhythm while using it in bedroom. Effectively protects your eyes from being damaged by blue light when reading. USB RechargeableEasily Charged with built-in USB, directly plug it into your laptop, power bank, adapter, car charger, or USB outlet for recharging, no additional cables needed. 200mA lithium battery, 1.5 hours charging lasts about 8 hours(at brightness setting). No more wasting money on batteries. 3 Brightness Levels30%, 60%, 100% brightness available, allows you to choose the perfect brightness to keep your eyes comfortable, enjoy your time reading in bed without disturbing your roommate. Short press to switch the brightness, long press to turn the book light off.Brightness memory function, it will remain the brightness level you selected before. Compact & LightweightMini size design, 1.37 ounce, small and lightweight, ideal for clipping on a book when nighttime reading; can be completely folded flat and slim, double as a bookmark, portable for reading on airplane, train, or backseat of car when travelling. Flexible Lighting AngleCompletely flexible design, the led lens can be swivelled 90left and right in horizontal direction, and 45downward; The 315flexible holder bends to any angle for your best viewing, no need constantly repositioning the light.