4 Deep-Kneading Shiatsu Massage Nodes: mimic the kneading and penetrating motions of a real massage therapist's hands, helps with relax and relieve muscle tension in the car, office and home.Perfect Massage Spot: allows massage your neck, lower and upper back, shoulder, lumbar, waist, leg, calf, foot and so on. It is programmed with 20minutes auto shut-off and equipped with the over-heat protection device.Heat Function: The massage nodes can be heated to about 112 F, good for blood circulation and don't hurt your skin. UL approved power adapter works with wide voltage (110-240V ).Ergonomic W-design: compact pillow massager fits perfectly behind neck and body contours.Warranty: Undamaged Naipo products can be returned within 30 days of purchase to receive a full refund for any reason. We also offer a 24-month gurantee for quality-related issues.