The Dyna-Flex Powerball makes the cover of Time magazine as one of their top 10 digital devices of the year. It features a balance rotor and removable top cap, which allow insertion of the optional digital speed meter. Generates from 32lbs to 35 lbs of torque when speeds of 9,000 - 13,000 RPM's are reached. The ultimate in engineering design, featuring the same user-friendly features as the Dyna-Flex Pro Plus but incorporating an on board generator. By activating the gyro, a dynamism (motion) is created, which will activate LED lights, located in the interior of the gyro. The faster the unit runs, the brighter the lights will be until the whole hand is engulfed in a bright glow. Just when you think you've seen it all, along comes the ultimate hand, wrist and arm Exerciser, the Dyna-Flex Powerball.