Function Controls
1. Lumbar Flexible support
2. Backrest Flexible support
3. Headrest Angle Adjustment
4. Headrest Height Adjustment
5. Headrest Flexible support
6. Seat Height Adjustment
7. Seat Depth Adjustment 
8. Armrest 4D Functions Adjustment 
9. Backrest Tilt Angle Adjustment
10. Backrest Tilt Tension Adjustment 
11. Adjustable Lumbar support