... 30pcs/ctn PAYPAL Accept! LED Magnet Energy Wrist Ball With LED Toy Ball for Good Health! There is no any battery or ... powered by rotating the wrist. The faster we rotate the ball, the stronger the dynamic and torsion is produced. The ... .Function:1.Perfect exercise gadget for sports like golf, tennis, squash, cricket, badminton, baseball, bowling, basket-ball,, motocross, mountain climbing.2. ...