Barby's voice, in his earphones!
"The Electronic Mind Reader"
John Blaine
Another girl added a few more bits to the network that represented the sleep-gas bombs and stepped back, taking off her earphones.
"Time Crime"
H. Beam Piper
She vacated the chair and handed him the operator's instrument with its light weight earphones and a mouthpiece that rested on his chest.
"Operation Terror"
William Fitzgerald Jenkins