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"In my mind I have gone all over the universe, which may make it less important for me to make piddling little trips... I did enjoy seeing Stonehenge. It looked exactly the way I thought it would look."
- Isaac Asimov

Command Microphone  
  A cloak that served as a microphone and public address system.  

Retief reached up and adjusted a tiny stud set in the stiff collar of his tunic. He tapped his finger lightly against the cloth. The sound boomed across the arena. A command microphone of the type authorized for a Battle Commander was a very effective device...

The Master of the Games stared at him aghast. This was getting out of control. Where the devil had the old man gotten a microphone and a PA system. The crowd was roaring now like a gigantic surf. This was something new!

From Diplomat At Arms, by Keith Laumer.
Published by Pocket in 1982
Additional resources -

Normally, the microphone only captures the voice of the wearer of the tunic; however, it is possible to capture other sounds.

Retief drew his sword... "I will defend my position." He reached up and flipped the stud at his throat to full pick-up.

"To the Pit with your infernal Code!" bellowed the Master, and blanched in horror as his words boomed sharp and clear across the field to the ears of a hundred thousand people.

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