massage office chair 1.79.5*61*30 2.G.W:22 3.N.W:21 massage office chair1. Unique massage motion on back, and ... in the back and waist3. Adopt thump-pressing and kneading massage, and help eliminated pain and remove fatigue 4. Vibrating function ... metabolism, curing muscle sore, regulating biorhythm nerves, and dispelling fatigue. massage office chair