treadmill 1. heavy duty steel, Rohs certifed 2. inclinable, foldable, movable ... MP3 Plugin and Air Purifier ,two speakers built-in.Program : Manual, Interval, Rolling, Weight-Loss, Mountain, Hill-Run ,total 51 programmes ... to move with the moving wheels.20FT/40HQ: 36PCS/97PCS Treadmill ATM2201