I'm pretty sure this hearing aid is intended more as art, to look pretty, than to serve any actual function as a hearing aid.
Take a look: it's a ring designed as an ear horn.
Industrial artist Gina Hsu came up with this concept and is selling them for $474. Crunch Gear has termed it "Gadg-Art": "You don’t actually expect to use it. Plus, at 340 Euros, you don’t want to scratch it or damage it."
What do you think of those old ear trumpets, so often associated with older people and olden times, getting the artsy treatment?