The Comfier black back massager features Shiatsu rollers with 4 rotating nodes that can move up and down mimic the massage hands perform deep tissue massage on knots and tension muscles which brings relaxation throughout the body Helps eliminate fatigue stress and muscle aches. COMFIER Shiatsu Back Massager with Heat -Deep Tissue Kneading Massage Seat Cushion Massage Chair Pad for Full Back Electric Body Massager for Home or Office Chair use Gifts for Men Dad