The power of the wind and the sun

It seemed to me an interesting gadget. Charging device that supplies energy from the sun and wind ... (although the latter seemed to me rather doubtful how such a small "cooler" can charge something)
According to the manufacturer, the battery charges in 1 hour on a sunny and windy day, and can charge up to 5 cell phones or 10 iPods.

I was pleased with the design of the device, which is unusual for devices of this kind ...