Finger phone

Ubi-wa.

That's the name of a Japanese invention, and it means "Finger ring" or "Speak by finger." The BBC News reports that turns your finger into a phone receiver.

In noisy places where you cannot hear who you are calling, you simply place the Ubi-Wa bearing finger in the ear.

The ring converts speech sounds to vibrations. These travel down the bone and into the ear canal, which obligingly turns them back into intelligible speech.

The buttons are going to be too small for pressing with a finger, so you'll have to tap out pre-defined rhythms with the finger to make it do what you want.

Sounds cool, except for the name. I grew up around New York, and when I think of "speak by finger," I think of something that looks like this.