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Headphones - Wikipedia

Headphones (or head-phones in the early days of telephony and radio) traditionally refer to a pair of small loudspeaker drivers worn on or around the head over a user's ears. They are electroacoustic transducers, which convert an electrical signal to a corresponding sound.Headphones let a single user listen to an audio source privately, in contrast to a loudspeaker, which emits sound into the ...