Bicycle USB-dynamo is the perfect source of green energy – the dynamo generates free electricity while you ride. The Kit allows you to use this power to charge your Phone, GPS or other USD-device on your bike. Perfect for long tours where you need to keep your phone charged. A power converter with safety circuit conditions the power and keeps the device you’re charging protected from surges. The standard USB connector allows you to directly charge a number of different electronic USB-devices.