Backrest with six-roller motor driven,3D function with "L" struction which can enjoy the most comfortable mechanical massage for backrest From head to hips, according to the hunman body engineering then invention of the "S" shape orbit on the back. Shoulders, armrest,seat part and calf with Gasbag massage.Footrest:flexble with spring.Three rows of six groups of roller massage under the feet. Waist with heating function. With zero gravity. Entertainment: with stereo player.