This is the basic version, without a display, but a great price nonetheless.
Designed to improve the wrist muscles, simply set the inner section spinning, rhythmic circular hand and wrist movements not only maintain the rotation, but also make it steadily faster. Increased in centrifugal forces make it harder to keep hold adding resistance to your wrist thus making you stronger.
Not only is this a great exercise for your wrist, it is also extremely addictive as it incorporates a high score system.
The perfect instrument to gently rehabilitate lower forearm and wrist joints affected by carpal tunnel syndrome, repetitive strain injury, arthritis & previous breakage.