The product is called sOccket!
It is a soccer ball that stores the energy from being kicked and bounced around, and then can be used as an electricity source when you take it home. The generated electricity can be used to light an LED lamp or charge a cell phone, for example.
This amazing gadget is the brainchild of a group of Harvard students. It will be a high-end product in Western countries, but profits will go to provide low-cost balls to Third World nations. To see a picture of the socket, go here.
Great way to have fun and save some energy!