A. CUSTOMIZE YOUR ILLUMINATION: The book light for reading in bed has 3 color temperatures and 3 brightness settings. The brighter setting can light up 2 full pages of any size book, and the lower one can create a private reading space for you when your partner is sleeping next to you. B. RECHARGEABLE LONG - LASTING: The built - in rechargeable battery provides around 4 - 70 hours of even and eye - friendly light based on your brightness setting. In about 1.5 hours, you can fully charge the rechargeable book light with the included micro USB cable. C. AMAZINGLY LIGHTWEIGHT: The mini reading light is quite lightweight (only 1.3 oz), so you may hardly feel the added weight when you clamp it on the book. The foldable design makes it take up little space, similar to a mouse, and it's easy to pack for traveling. D. WELL - DESIGNED CLAMP: The led reading light clip opens approximately 1.2 in and offers a secure grip for thin objects, which is suitable for books, e - books, tablets, etc. The non - slip clip is also padded with soft sponge to prevent leaving marks on your book and e - book cover. E. FLEXIBLE METAL GOOSENECK: Its gooseneck is flexible, allowing you to position the light where you need it. It is covered with metal material, which can increase the durability and lifespan of the book reading light and reduce the lamp head shaking during use.