The performance of the new The Plug III has been improved mainly in the low and very high-speed ranges. Weighing only 46 g, this USB charge adapter simply replaces the headset cap. The electronics is compatible with the iPhone and nearly all mobile USB devices. The Plug III will produce clean 5V / 500 mA USB power from the AC current of hub dynamos from speeds of 11 km/h (7 mph).
Included is the Expander insert for The Plug III. This makes fitting the plug much easier and safer for passing through the cable from the capacitor.