NPR: With The Flick Of A Switch, It’s Crystal Clear To Hear

For the more than 10 percent of Americans who have some form of hearing loss, mass transit can be frustrating, especially on a busy travel weekend like this one. Even if you wear a hearing aid, trying to hear in places like airports, theaters and places of worship can be tough.

But a group of advocates is changing that by putting a not-so-new technology called telecoils to work. The coils are small wires hidden inside a majority of hearing aids that, when activated, amplify sound emitting from magnetic sources, like loudspeakers.