relevant to your interests
https://www.youtube.com/watch?v=iRusbYIyRNI
Don't they normally work better if you plug them in?
It is plugged in - that's a switch on the control plate (I had to look twice though).
@bq started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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relevant to your interests
https://www.youtube.com/watch?v=iRusbYIyRNI