Does Your Child Have These Problems : Lie on the desk to write, look down to read, distracted. This product is designed to solve these problems. It can improve the sitting position to protect the child's eyesight and the normal development of the spine, improve the child's attention. Improve Sitting Posture: This Sitting Posture Corrector pretty suitable for Students, to correct thire posture, protect them eyes and spine, make them healthy growth. Height Adjustable: The height of the sitting orthotic is Adjustable, suitable for children. Both boys and girls can use it. Easy to Use: Just clip the bottom shelf onto the desk and adjust the height of the orthotic according to the height of your kids. Can clamp a table with a thickness of 0-4cm(0-1. 6 inch). Use it easily for 1 hour a day to say goodbye to hunchback and myopia.