If diy doesn’t work I’ve been using loud bicycle horn and it works great.
https://loudbicycle.com/
Gah! mini usb instead of USB C. Love the concept but it is remarkable how long bike accessories have been holding out on USBC.
I’ve got one of these fwiw, and it’s outstanding.
Gah! mini usb instead of USB C. Love the concept but it is remarkable how long bike accessories have been holding out on USBC.