Parallel Halo Power Wrist Ball AUTO Start Challenge Gyroscope Wrist Exerciser with Color Changeable LED Lights Forearm Arm Strengthener for Sthengthening Muscle and Bones

How to Start it 1. Pull off the plastic insulation before use. 2. Toggle the ball along the double direction arrow to the max resistance,then release it,fast enough to have the ball turn the LED on. 3...