8 Massage roller balls - This shoulder massager comes with 4 Big nodes and 4 small nodes, which provide deep tissue massages on your neck, shoulders, upper back, lower back, waist, Foot, thighs, calves, legs, feet and arms . All this in the InvoSpa shiatsu neck & back massager with heat. Adjustable intensity - This shiatsu neck massager with heat and shiatsu back massager pad has 3 speed strength levels, which allow you to get the right and appropriate amount of pressure on your muscles 2 Massage directions - The InvoSpa neck and back massager with heat built in a Bi-directional movement control to mimic the motion of an in-person massage experience. These 3D Shiatsu massagers for neck and back will auto-reverse each minute for a better distribution of massage effects. Heat function - our neck and shoulder massager with back massager has an optional heat function to enhance your massage experience