S-shape back rail and four-roller massage mechanism system conform to body’s curve ; rolling, kneading, pressing, tapping, hitting or combined over ten massage functions; comfortable air pressure in seat,  legrest and footrest; advanced and original wide-angle VFD display on control; auto/manual control program; automatic adjustable angle controlled by dual electric power actuator on backrest and legrest; 24V safe internal circuit design is convenient for customers’ safety certificate application in any country.