TimeWalker

Note that the maintainer of Betterbird has been permanently banned from the Mozilla community. He even still mentions it in this specific page. There’s not very much more info about this, the only thing that does maybe show their true colors is with [https://github.com/jobisoft/HtmlSourceEditor/issues/4](issues like this one) where he seemingly sent copyright threats privately to other open source projects.

Here’s the thread about the db-version and the change log for the db-version branch

Ah, sorry about that. I just found out that they have licensed out their audio and video division to TP Vision which is a subsidiary to TPV Technology and that’s Chinese

Philips Fidelio L4 could also be a good candidate. It’s very similar in features and has very high battery life. I have gifted one for my partner after seeing his old headphones fall apart and he’s very happy with it. It did get a bit more difficult with stock but maybe you can find it for 200€