A team of young Korean designers have invented a battery charger that runs on 100% renewable energy. The Febot might look a bit like a torpedo that’s gone wrong, but the in-built propellors mean that each one can generate enough energy to top up a rechargable AA battery.

Now here’s the fun bit. The Febot comes with a suction cup that allows you to attach it to pretty much any flat surface or structure. In theory, you could attach it to the outside of your window, or even the top of your car. Just imagine—a tiny little wind farm all of your own.

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