This car seat massager with 8 powerful vibrating massage motors target upper back, mid back, lower back, and thighs to help relieve muscle pain, tension, stress. You can even select all 4 zones at once or individually to your liking for back massager. Our back massage Heating pad with auto shut off target full back and seat, to radiating gentle warmth, to sooth and loosen tight and soreness muscles and improve blood circulation.