Jabra is a danish company producing mostly professionally used headsets (I know them for their business stuff which is widely used in telecommunication). As I’m not sure what suits you as open ear I suggest you look up their portfolio.

Great guide, thanks! Will start converting (where not already through with it).

Maybe someone can help with this topic: Is there any EU-based live map service (including traffic jams and road work and the likes)? I already use OSM but that doesn’t (can’t by design as far as I know) include live information.

Entirely universal bus?