Just adding to this, for the general audience, hearing aids are thousands of dollars, and virtually all users describe the industry as a "racket." Features that

Just adding to this, for the general audience, hearing aids are thousands of dollars, and virtually all users describe the industry as a "racket." Features that improve their functionality, such as adapters for Bluetooth etc., are dedicated hardware modules with proprietary interfaces, and expensive too. Also, everybody I know who has hearing aids eventually ends up getting them at Costco.