Students from Rio de Janeiro developed a device that can recharge mobile phones with the movement of the legs. It is called "Onix" and does not need any kind of connection with the electrical chain of the city.

It is very small and light. About 6, 5cm x 7, 0 centimeters and weight less than 500g. 

The device is tied in around the knee level. It is connected with aluminum stalk until the leg level. So, every shake of the stalk transform kinetic energy into electrical energy. Whether the person walks about three hours, the battery can be completely filled up of energy.

I think that the invention is totally suitable to cooperate with a sustainable development that our planet is requiring. It can decrease so much greenhouses gas emission and negative impacts.

Hopefully, the idea will become popular among a lot of countries and it will support us to cure the world.