This is the cordless heated back wrap that adjusts to relieve sore, stiff muscles and joints across eight different muscle groups. The wrap is made from flexible, mild-compression neoprene and comes with two adjustable hook-and-loop fasteners, allowing it to be placed on the back, neck, shoulder, elbow, abdomen, thigh, knee, or ankle. Virtually undetectable carbon-fiber heating elements generate deep-penetrating heat that soothes muscle aches, helps improve blood circulation, and reduces swelling. Its slim lithium-ion battery provides up to up to five hours of heat therapy after a four-hour charge, allowing freedom of movement while receiving heat therapy. The wrap adjusts to four different levels of heat output from 95° F to 120° F and shuts off automatically after 30 minutes to preserve battery power. 12" H x 16" W x 1/4" D. (9 2/3 oz.)