They're terribly expensive for something so simple
https://www.instructables.com/id/10-BICYCLE-USB-CHARGER/
not sure I believe this guy that's definitely not waterproof is it
They can take my money if that's simple
The Sinewave ones major expense is the machining of the unit. Look at their matchbox style one, it’s about half the price.
@PhilDAS started
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They're terribly expensive for something so simple
https://www.instructables.com/id/10-BICYCLE-USB-CHARGER/