The bike is Motorola phone charger and basically while the rider is pedaling it charges the phone connected to the bike. By biking the wheel generates energy which then it is rerouted back into the phone. I think is a pretty neat device in many ways because it really helps bikers multi task a lot better an safer, and a nice way to save money on the electric bill. This concept would be a lot better if it was applied to other rechargeable electronics as well which was mentioned by the reviewer of the product. If I had a bike and the device was more universal I would most definitely get one.