Features： 1、Improve Sitting Posture: This sitting posture corrector is for students to correct their sitting posture, protect their eyes and spine, and allow them to grow healthily. 2、Easy To Install And Use: Just clip the base part on the table, then adjust the height of the corrector according to the child's height, the adjustable height range is 5.9-8.3in. 3、Avoid Visual Impairment: Helps improve bone deformation caused by wrong sitting posture, avoid visual impairment, and also cultivate good sitting habits. 4、Full Viewing Angle: No blocking line of sight, keep your child in a good sitting position without constant reminders, protects vision and contributes to the normal development of the spine. 5、Exquisite Workmanship: Attention to details, finely polished button, non slip base, adopts soft silicone material, skin friendly, comfortable to use. Specification： Item Type: Sitting Posture Corrector Material: PP+ABS+Silicone Adjustable Height Range: Approx. 15-21cm / 5.9-8.3in Can be clipped on the table Package List： 1 x Corrector 1 x Base