The BikeCharge Dynamo Lets You Juice Up Your Devices While You Cycle

This is definitely one of the greenest ways to get around the neighborhood, where you not only save money as you do not burn precious fossil fuel, you also get to enjoy a decent workout in the process.
With the BikeCharge Dynamo installed onto your bicycle, this mounted DC generator is said to be compatible with majority of the smartphone brands out there, and a full charge would more or less require approximately 2 to 3 hours of pedaling.
(thanks Cora)