Triple Action Back Belt - 4-in-1 TENS Belt for Back Pain - Essential PackageDR HOS Triple Action Back Belt is a wearable back support with a built in nerve and muscle stimulator that not only supports your back, but also helps to relieve your back pain using our patented AMP Pain Relief technology. What sets this back support apart is the patented AMP technology a groundbreaking combination of four pain therapy technologies: TENS, EMS, NMES and Auto Modulation. These technologies work to relax muscle spasms, increase local