When you see a blue sign of a human ear that’s a cue to hearing aid users that they can press a tiny button to hear a special broadcast sent directly to their device. This is called a hearing loop, a thin copper wire that radiates electromagnetic signals in a room. A tiny receiver called a telecoil built into most hearing aids and cochlear implants picks up the signal. With the flip of a switch on the device, sound comes through with greater clarity than can be heard by someone with normal hearing. This might be music, sound from a movie, a or a speaker. Hearing loops are better known in Europe than in the US, where only about a thousand have been installed in museums, stores, theaters, airports, and sports arenas.
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