• 19"-22.5" adjustable seat height to fit people of different heights• Pull out the lever for unlocking• Tension adjustment knob (tight & loose) to adjust the backrest angle• S-shaped backrest fits your body curve back support• 90° -105° rocking function for fatigue relief• Premium leathaire, oxford fabric, and soft sponge for long-lasting comfort• Supports up to 330 lbs with 5-claw base and gas lift• 5 rolling casters make it easy to move around• Additional back support & handle for convenience• Ideal for offices, living rooms, bedrooms, and studies• Assembly required