This device uses gentle, methodical movement to help alleviate back pain without the time or expense of visiting a chiropractor. While lying on your back, simply place your legs on the padded supports and the device automatically tilts back and forth in 12-minute sequences. The exercises decompress vertebrae to alleviate pinched nerves and muscle spasms. The device uses continuous passive motion, a low-impact rehabilitation technique developed by joint and pain specialists, to promote proper spine alignment and strengthen spine-stabilizing muscles without requiring you to initiate the movements. When used daily, results can be felt in seven to 14 days. Height-adjustable for people 4' 8" to 6' 6" tall. Plugs into AC. 19 1/2" H x 16" W x 9" D. (10 lbs.)