The book lights for reading at night have 3 colour temperatures and 3 brightness settings. The brightest setting easily lights up 2 full pages of any size book, and the lowest one creates a private reading space for you when your partner is sleeping next to you The rechargeable reading light provides 4 – 80 hours of even and eye-friendly light based on your brightness setting. In just 1.5 hours, you can fully charge the clip on book light with the included micro USB cable The clip on reading light is so lightweight (only 39g) that you will hardly feel the added weight when you clamp it on the book. The foldable design makes it take up very little space, just like a mouse, easy to pack for traveling The book reading light clip opens about 3 cm and offers secure grip for thin objects, which is very suitable for books, e-books, tablets, etc. The non-slip clip is padded with soft sponge to avoid leaving marks on your book and e-book cover Its gooseneck is flexible so you can position the light exactly where you need it. And it is covered with metal material, which increases durability and lifespan of the LED reading light and avoid the lamp head shaking during use