The Dynaflex Blue Gyro PowerBall Hand Exerciser Docking Station spins at up to 15,000 RPM with up to 40 lbs. of torque to help improve your coordination while building the strength of your grip. LED lights flash faster and faster as your gyro gains speed for a fun light show while you work out. Included PowerDock docking station activates the gyro to get it up to operating speed in just a few seconds. Easy-grip outer sphere allows increased control and prolonged usage. Variable resistance is achieved by increasing or decreasing the speed therapeutic for hands, wrists, arms, biceps and triceps. Aids in the prevention of repetitive stress injuries such as carpal tunnel syndrome. Get the edge in rock climbing and any other sport that requires control and a strong grip.