Comfortable & Adjustable Brightness:Designed with 18 LED bulbs (18lumen), which gives out natural and non-flickering light that won't hurt or strain your eyes. And there are 3 light modes, you can adjust the brightness simply by touching the switch. USB Rechargeable Battery:Extraordinary battery life with 1200mAh built-in rechargeable battery and USB charging cable, you can use the high light last up to 3 hours after fully charged, and the indicator light will turn from red to yellow when it's fully charged. Portable & Flexible:The book light features mini size and compact design makes it very easy to carry. Sturdy and flexible (360 degree) goose neck allows you to position your light anywhere you want. Application Perfect for reading, working, studying, emergency use, suitable for study, office, bedroom, living room, dorm use, also perfect as a night light for baby room