USB bike stem cap

cults3d

Powering up is made easier with a convenient stem cap that accepts a USB plug. To install, simply slide the electronic regulation component into the fork tube. This versatile part includes a reliable USB cigarette lighter charger. A diode bridge, a capacitor and a protective zener diode work together to rectify the current produced by the dynamo hub, powering the USB charger with ease. Two strategically placed holes on either side of the plug allow you to securely attach a home phone holder.