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A headset combines a headphone with a microphone. Headsets are made with either a(n) single-earpiece or a(n) double-earpiece (mono to both ears or stereo). Headsets provide the equivalent functionality of a telephone handset but with handsfree operation.
They are sometimes known as earspeakers or, colloquially, cans. The in-ear versions are also known as earphones or earbuds. In the context of telecommunication, a headset is a combination of headphone and microphone.