The angle of the bookstand holder platform could be rotated different levels as you wish.Two green brackets on the book stand hold pages in place.It can also be expanded to fit larger size books.The accountant can promote students' correct posture, resulting in less neck, back and eye pain when children reading over time, guarantee eye health and working position, effectively reduce eye fatigue and physical fatigue.It's easy to fold when you're done.It is portable and practical design style, can be stored in your backpack.Silicone rubber mat included, four feet stand holders will not slide freely when you read on different desk.It will be used for wide range application where supports various books, cookbook, catalogs, iPad & tablet, documents at comfortable reading angle.It is suitable for children, students or adults at home, office, school, library, bookstore and so on.