Headphone bluetooth conversion

Hello,during the 2020 pandemic I attempted to convert my old pair of headphones into a bluetooth set.First used some Chinese no name brand headphones that had a radio into the case.I used that specific model because the case had a relativ big space into them.I used a blutooth module that has a charging li ion battery circuit and a low amp circuit into the board.I salvaged the board from a low amplfied speaker.In the end the headphones are unpractical because I don't own some modifying tools.Maybe in the future I will end this project and I will post the finished project.

Here is the YouTube video: