Willfun Hand Exerciser Balls Forearm Trainer Grip Strengthener Wrist Exercise Pro AutoStart Gyroscope Balls with LED Light and Counter

What is the use of this gyro ball? Gyro ball that has a mechanism allowing you to rotate your hand to increase the revolutions per minute (RPM) of the gyroscope itself. It is a quick and effective way to strengthen your grips,wrists,and forearms.And the counter on the gyro ball will help you build plan and exercise your hand more scientifically. What’s Included: Gyro Ball（Auto-Start）*1 Gyro Ball Bag*1 Counter*1 User's Manual*1 What is the use of the counter? The counter can show Total accurate revolutions,Current revolution speed,The highest RPM,The physical strength index,recording your challenges,your achievement.And it can also help you build plan and exercise your hand more scientifically. If you have any problem with operation or quality or any other issues,please feel free to contact with us,we will try our best to give you a satisfied solution.