Chair Height Pneumatic seat height adjustment. Locks in any position. To lower seat height, lift up on the lever while seated. To raise chair height, pull up on the lever as you lift your weight off of seat, release lever to lock in position.
Backrest Height Adjust backrest support to fit your needs. Simply loosen knob #1 and raise or lower the backrest to fit your body. Tighten knob #1 when you feel the most comfortable back support.