ENERGY BALL / portable source

With the development of electronic products,people rely more and more
on cell phones,tablet PCs and so on.But they may run out of electricity
at a critical moment.If our mobile chargers run out of electricity at the
same time,we can do nothing.The Energy Ball is a production combining
yo-yo and mobile charger.The bearing in the yo-yo which has a high
speed rotation drives the micro generator to charge the battery inside.
This will not only save electricity, but also makes you exercise and avoid
lacking exercise.Another advantage of yo-yo is that it can makes you
exercise the brain.