Are you searching or asking someone else to search?
Anyway, there's a Welltech in India but their web site doesn't show any wireless headphones or base station. You may want to contact them (contact link on web site) and see if they once made headphones and see if they can help if they did.
Unless you're into water managment, there weren't any other results for electronics
I want to attempt the repair of the base station of this wireless headphone gadget. But I need the schematics.
Anybody could help?