This is the device that uses an adjustable air cushion, heat, and vibration to help alleviate lower back pain and stiffness. It inflates to your preferred level of firmness to help restore the healthy curvature of the spine, provide a relaxing stretch, and improve flexibility as well as range of motion. It also employs vibration massage to knead out knots and three levels of heat to promote circulation. Its air inflation, vibration, and heating functions can be operated independently or together, and it also has two automatic modes. The unit can be used while you are lying down or placed against a chair’s backrest to reduce strain during long periods of sitting. AC adapter.