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Headphones are a pair of small loudspeakers that are designed to be held in place close to a user's ears. headphones either have wires for connection to a signal source such as an audio amplifier, radio, cd player, portable media player or mobile phone, or have a wireless receiver, which is used to pick up signal without using a cable. they are sometimes known as earspeakers or, colloquially, cans. the in-ear versions are also known as earphones or earbuds.