Features: Book holder is arc design, easy to turn the pages. Provided you clip lamp, 2 working modes, adjust light angle, usb c-harging port design and 3 * AAA batter-ies operated , convenient multiple p-ower ways via laptop, p-ower bank, p-ower adapter etc. Nice clip design, book g-ravity is s-teady and not easy to incline. Fits for most types of books, pad and can be functioned as a safe cellphone holder. Adjustable book holder length design, suitable for different size of books, the back bracket can be rotated within 180, which helps you meet height of different perspectives. Adopted safe reliable ABS material, equipped with anti-slip rubber mat, it provides you a comfortable reading, protecting the cervical spine, correcting sitting posture. Widely used in school, office, library etc.