When you move, you create energy. Most of the time this energy is lost but thanks to the wonders of technology, there are new ways to harness that power and let you interact with it in useful ways. The Siva Atom Is a battery bank that you charge by riding your bike.

This handy little attachment stores energy generated by cycling in a battery that can be used to power other devices via USB. That means if the power goes out on your block and you need to charge your mobile, take a few trips around the neighborhood and you’ll be able to bring life back to it.

It is weather resistant and can be used to charge a wide variety of devices. This is great for people who do long distances on their bikes and also people who just jet around their corners of the city. Just be advised that it doesn’t work with disc brakes. If you’re already riding your bike, why not get some eco-friendly power out of it? The Siva Atom is $129.99.