Radio, Telephony. a device consisting of one or two earphones with a headband for holding them over the ears and sometimes with a mouthpiece attached.
earphones or headphones.

1920–25; head + set

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World English Dictionary
headset (ˈhɛdˌsɛt)
a pair of headphones, esp with a microphone attached

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The simulator involves a headset an integrated video monitor and a remote
  control of the sort used to manipulate the machinery.
Use a headset, so you'll have your hands free to take notes.
The armrest headset connections may or may not work.
And using a hands-free headset instead of a handheld phone made no difference
  at all.
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