The KB-200B has an EZ Height Adjustment Lever with a built-in spring system that allows you to quickly and easily adjust from one height setting to the next, making it ideal for a teacher/student or parent/child situation. With a simple pull of the lever, you can switch between 4 preset seat heights. The KB-200B features the Hercules' Micro Adjuster Knob for up to 3.14 inch of additional fine tuning adjustment. When needed, the KB-200B quickly and easily folds flat for easy transport or storage.