This is the cordless back wrap that combines heat therapy and electrostimulation to provide drug-free pain relief. It employs transcutaneous electrical nerve stimulation (TENS), an approach widely embraced by physical therapists and other medical professionals, to deliver harmless electrical pulses to the back to block pain signals from reaching the brain. Its heat setting delivers soothing warmth up to 109° F that helps loosen knots and speed circulation, accelerating the body’s repair of the injury—clinical rests have revealed that combining heat and cold with TENS is four times more effective for treating pain than TENS alone. A controller lets one create a customized 10-60-minute treatment by selecting from eight modes, 20 intensity levels, and two heat settings. Heat and TENS can be operated individually or together. With USB charging cable and auto shutoff. Machine washable. Fits waists up to 62". Not for use with pacemakers. (13 lbs.)