JFT 3D Auto Air Cushion SJ03-B-1 For those suffering from lower back pain and sciatica KALOS BEAUTY TECHNOLOGY JFT 3D Auto Air Cushion, featuring one-touch auto-moving function, USB specification, 60% reduction in body pressure, lower back pain relief, breathable, fatigue-resistant, patented Air-Through structure Operation confirmed No defects *The instruction manual was difficult to understand, but the manual mode is the function to adjust the air pressure by pressing the + and - buttons while the power is off. Thank you.