Supernova ThePlug III Dynamo USB Charger

Use The Plug to charge GPS, smartphones, and USB lights on the move. Compatible with USB-A connectors, it charges at 5V/500mAh at 8 miles per hour. Charges at 5V/500mA at an average speed of 8mph. Does not include Steerer Tube Expander Plug. Now further improved with no upper charge speed limit. Replaces headset top cap. Supernova does not recommend the simultaneous use of a dynamo lighting system and the Plug. Transforms dynamo AC to exact USB spec. DC from 12 km/h. Works with most USB charged devices. Verify device charging requirements with the device's manufacturer. Light Part: Recharger.