Meet the Ride-a-long: a device charger powered by your own legs. It is designed for those of you who love cycling. The charger converts leg power into electric power and is capable of charging all kinds of USB-powered devices, including GoPro, iOS, and Android smartphones. You don’t need fancy tools to install the device. As you ride, the spin of your rear wheel works with the integrated generator to charge the battery pack.
Ride-a-long ships with a 1650 mAh battery, which you can charge at home when riding your bike is not ideal. Just ride your bike, and you will be able to generate energy for your smartphone outdoors. The device is available for $129 at this time.[where to get it]