Developed by pain specialist Dr. Michael Ho, the 2-in-1 Back Decompression Belt is unlike any other support or back pain belt because it provides both traction and decompression therapy. Back Decompression is a proven technique endorsed by medical professionals and used in both upper and lower back pain treatmentSize: 25''-41''Directions: Remove the protective covers from the gel pads and connect the gel pads to DR-HO'S® Pain Therapy System or your chosen DR-HO'S TENS device. Wrap DR-HO'S® Pain Therapy Back Relief Belt around your lower back and adjust gel pads so they fit firmly on your lower back and directly against your skin. Activate your DR-HO'S TENS device by slowly turning the intensity dial until you begin to feel the sensation and adjust the mode and timer to your desired specifications.After treatment, place the protective covers back on the gel pads to protect them from dirt and debris.Caution: Do not use if preganant or have a pacemaker.