This Pedal Exerciser with Digital Display & Adjustable Resistance M37352 is designed for low impact rehabilitation and exercise. It is great for non-weight bearing exercise, as it is used from a standard seated position in a chair. This pedal exerciser incorporates an integral on-board computer that shows exercise time duration, calories consumed, cycles and revolutions per minute.The resistance of the pedals can be adjusted to increase or decrease the effort required to use the exerciser, therefore allowing for progressive increases in effort and fitness.The resistance knob for this product is supplied packed separately in the packaging. It simply screws into the main unit and can then be used to set the desired pedal resistance.