Product Detail PACKAGE:20PCS/CTN MEAS:57.5X34.5X51CM WEIGHT:18/17KGS 1) Main material: PVC + nylon. 2) Character: through air pressure, invigorates the whole body. 3) Calms tired legs. 4) Soothes muscle fatigue. 5) Simulates the pumping action of exercise. 6) Relaxes muscles. 7) Operated by adapter or 4pcs of 1.5V AA batteries (not included). 8) Accessory: 2 air/thigh massagers, 2 foot/calf massagers, a pressure control unit, a AC/DC adapter (if demanded), complete instructions.