Motorized pedal exerciser can be used to strengthen both arms and legs, while improving stamina and relieving stress and tension for greater focus and concentration. Motorized pedal action with 12 speed settings for picking the perfect pace to reach your goals. 6 built-in Automatic Programmes, 1 Manual Programme, Max speed: 80 RPM. Leg protectors made from soft cotton and steel bracket, The max length is 33 cm (13 inches) and max width is 15.5 cm .It is designed to fits most stationary bike and exercise bikes. Best Effect after using :to stimulate muscle movement, achieve the purpose of ;make muscle tension compression, enhanced the ; improve blood circulation,.