Ideal for sport enthusiast to be more visible in the dark while doing your sport routine.
Really comfortable and easy to use; it use Neopixels and Attiny85 micro.
It can be programmed with just one button, it has 6 different colors and 3 modes of use:
-Always on in one color (safety yellow) helps with fog.
It can be build to be rechargeable using a LIR2032 battery or save in components and just use a standard CR2032.
The flexible board and the standard PCB are separated to reduce on cost and are soldered together.
In the link you can find all the necessary files.
The project is free to use and modify.