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Supernova Plug III! These puppies are hard to find. We got ours direct from Germany. The 3rd generation provides more consistent charging across a wider range of speed. Just wire one up
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Amazon.com : Supernova ThePlug III Dynamo USB Charger : Bike Lighting Parts And Accessories : Sports & Outdoors
![Sinewave Cycles Beacon front light in our long-term test - Exclusive dynamo bicycle light with charging function | GRAN FONDO Cycling Magazine Sinewave Cycles Beacon front light in our long-term test - Exclusive dynamo bicycle light with charging function | GRAN FONDO Cycling Magazine](https://s14761.pcdn.co/wp-content/uploads/sites/3/2021/01/Sinewave-Cycles-Beacon-2020-GF16-WEB-018-1140x760.jpg)