6 adjustable reading positions: adjustable angle between 0 and 68 degrees. The book holder with different notches on the movable backrest can be adjusted in height and angle as needed. Promote proper posture to improve spine health. The bookcase can be quickly folded for easy storage. You can carry and store it in a backpack for outdoor activities without taking up too much space when not in use. Also suitable for home, school, library, dorm room, etc.