headset

noun

1. A pair of headphones or earphones, or a singular headphone or earphone, typically with an attached microphone.
2. Any electronic device worn on the head.

   “If you've just acquired a Google Glass headset for £1,000, don't show it off at the movies. UK cinemas are to ban the headsets over fears that the gadgets can be used to make pirate copies of Hollywood blockbusters.”

3. On a bicycle, the system of bearings that connects the fork to the frame.
4. (uncommon)A mindset.

   “One member has this whole collection of 50s rockabilly by women. Like the blues, the lyrics reflect the headset of the time, so of course it's not all "non-sexist." But it's a great record, really connected to the roots of rock 'n roll.”