The CanDo Magneciser vertical shoulder exerciser (shoulder wheel) with height adjustable wall mount offers ultra-quiet magnetic, bi-directional resistance. Adjustable height allows for sitting, standing, or wheelchair access. Arm adjusts from 13 to 22 inches to adjust the arc of the shoulder wheel. Each unit comes with a fully automatic 5-function digital LCD display; speed, elapsed time, calories, distance and scan of all functions. Resistance is controlled by turning the resistance knob. Units use 2 AA batteries (included).