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HEADPHONES

Headphones (or head-phones in the early days of telephony and radio) are a pair of small loudspeakers that are designed to be worn on or around the head over a user's ears

Features

1. They are electroacoustic transducers
2. which convert an electrical signal to a corresponding sound in the user's ear. Headphones are designed to allow a single user to listen to an audio source privately
3. in contrast to a loudspeaker
4. which emits sound into the open air
5. allowing anyone nearby to listen. Headphones are also known as earspeakers
6. earphones or
7. colloquially
8. cans.