earpiece
US /ˈɪr.piːs/
UK /ˈɪr.piːs/

1.
наушник, ушной вкладыш
a small device that fits into or onto the ear, used for listening to a radio or telephone or for helping people who have difficulty hearing
:
•
The security guard wore an earpiece to communicate with his team.
Охранник носил наушник для связи со своей командой.
•
She adjusted the earpiece of her headphones.
Она поправила наушник своих наушников.