The Zyllion Shiatsu Back and Neck Massager Pad with Heat (ZMA-13) delivers powerful 3D deep-kneading massage to relieve sore, tight muscles in the neck, shoulders, upper and lower back. Four bi-directional rotating massage nodes automatically change direction every 60 seconds to mimic the sensation of a real shiatsu hand massage. The optional infrared heat function enhances blood circulation and muscle relaxation. Velcro straps allow the massager to be secured to a chair, sofa, or car seat for hands-free use. Includes both a wall power adapter and car adapter for home, office, or travel use. A 15-minute auto shut-off ensures safety. Dimensions: 13"L x 9.5"W x 3.5"H; Weight: 4 lbs. Recommended by doctors of physical therapy for use with chronic neck pain, backache, arthritis, sciatica, and headaches.