For about 20 years since 1998, we have manufactured only a motorized inversion machine Z-UP motorized inversion machine was designed with ease-of-use in mind. Unlike inversion products made for home use that require individualized adjustments, this motorized unit is operated at the push of a button. The table slowly and easily rotates to any comfortable angle, allowing for a relaxed inversion experience every time. Users will appreciate the quality of workmanship and smooth, quiet motor. – FDA approved as medical device, UL listed as exercise machine for USA product. – UL listed as an exercise machine for USA products – KOREA PAT No. 0247230, USA PAT No. 6,149,560 Benefits (US FDA STATEMENT, 1999) – Stretches and relaxes muscles – Decreases pressure on the discs between vertebrae – Relieves back pain