The OP-4D Master by Osaki is the ultimate massage chair. Featuring a 4D Massage Mechanism with an SL-Track and Muscle Tension Detection, this chair is designed to provide you with a personalized massage experience. It also features Surround Sound Bluetooth Speakers, Zero Gravity Reclining, Space Saving Technology with Lumbar Heat Therapy, and 46 Air Cell Compression with an Automatic Footrest, all with an intensity level of 6-7. With 16 auto programs and 4 massage styles, this chair is sure to help you relax and de-stress.