[5 Brightness Adjustable] This small book light has 5 brightness levels available; you can choose the most suitable level for your eyes. You can set your favorite brightness as default with the book light for reading in bed. [3 Color Modes & Eye Caring] Unlike other reading lights for books in bed, our tiny book reading light has 3 different reading modes: amber mode(1800K), breeze mode(3400K), and precise mode(6000K). [USB Rechargeable & Long Lasting] Standard USB rechargeable and compatible with any USB ports on your computer, adapter, or USB outlet. This rechargeable book light has a built-in 500mAh battery providing 1080 reading hours (depending on your brightness setting). [Flexible & Portable Design] The clamp of the clip-on light can open maximally 150; the light head can be turned left, right, and downside with angles of 90, 90, and 45 respectively. It is flexible enough for all book sizes. You can adjust the angles freely to get comfortable lighting.