Dynaflex Docking Station with Amber Powerball 12080 Strengthening System Advanced gyro hand exerciser bundled with gyro docking station Increases your range of motion and conditions your arm and shoulder muscles Reaches up to 13, rpm and creates 35 pounds of torque resistance Amber LED lights located in interior, onboard generator and balanced rotor Docking station activates gryo within seconds, requires 2 AA batteries Advanced gyro hand exerciser bundled with gyro docking station Increases your range of motion and conditions your arm and shoulder muscles Reaches up to 13,000 rpm and creates 35 pounds of torque resistance Amber LED lights located in interior; onboard generator and balanced rotor Docking station activates gryo within seconds; requires 2 AA batteries