The Dynaflex PowerBall Gyro incorporates LED lights that flash faster and faster as your gyro gains speed. Not only will you feel yourself getting stronger using your Dynaflex PowerBall, you can tell how fast you're going by the stunning light show being created! The ultimate in engineering design, featuring the same userfriendly features as the DynaFlex Pro Plus but incorporating an on board generator and balanced rotor. The Powerball generates 40lbs of torque with speeds up to 15,000 RPM. By activating the gyro, a dynamism (motion) is created, which will activate LED lights in Blue which are located in the interior of the gyro.