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Earphones (also known as headphones， earbuds, stereophones, headsets, or by the slang term cans or face plugs) are a pair of small loudspeakers, or less commonly a single speaker, with a way of holding them close to a user's ears and a means of connecting them to a stereophonic, monophonic or binaural audio-frequency signal source such as an audio amplifier, radio or CD player. In the context of telecommunication, the term headset is used to describe a combination of headphone and microphone used for two-way communication, for example with a telephone.

The telephone earpiece such as the one pictured at the right was common around the turn of the 20th century. From the earpiece developed the headphones. Sensitive headphones were the o