These are the portable pain relief patches that adhere directly to the skin and provide deep, therapeutic warmth. A tethered controller sets the heat to one of three levels to help improve circulation, loosen muscles, sooth joints, and relieve pain. Ideal for use on the back, legs, neck, and arms, the pair of reusable 3" x 5" patches secure with adhesive backing and can be used up to 10 times before being replaced. Controller secures to a belt or fits in a pocket and charges via AC; a full charge provides up to eight hours of heat (on low setting).