This lumbar massager is made of soft fabric and PU foam, dimension 3614.531.5cm. Built-in 2000mAh rechargeable battery, working voltage 7.4V and rated power 24W. It adopts forward and reverse kneading rollers with 2 adjustable massage intensities and constant temperature heating therapy. Ergonomic shape fits your waist perfectly to ease stiffness and fatigue caused by long time sitting. Lightweight and portable, ideal for sofa, office chair and car seat. Perfect for daily relaxation and gift giving.