A wired monaural ear loop to listen to sound from a receiver. Used instead of headphones.
Most consumers dislike using them: they are uncomfortable, people like to hear from both ears, and they often do not stay on the ear.
It is also called D-ring, ear loop, ear loudspeaker, single ear speaker, surround earphone (WilliamsAV), Universal Ear Speaker (ListenTech), and other proprietary terms.
graphics: WilliamsAV and ListenTech
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