Headset
Multiple realities
(covers information from several alternate timelines)
Scotty wearing a headset
A bouncer wearing a headset
A headset was any device worn on the head for interfacing with compatible technologies.
The Ktarian game was also a type of headset device. (TNG: "The Game")
A virtual sensory display was the description Jadzia Dax gave to the headsets worn on Dominion warships. (DS9: "The Ship")
In the alternate reality, Montgomery Scott wore a headset while working the controls of the transporter aboard the USS Enterprise in 2258. (Star Trek)
In 2381, a bouncer on Starbase 25 wore a headset. (LD: "An Embarrassment Of Dooplers")