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" I try to sit down at the typewriter four times a day, even if it's only five minutes, and write three sentences. And if I feel like going on, or if something turns me on I'll just keep writing till I'm written out."
- Roger Zelazny

Companion Implant  
  Electronic device placed within the body; it has a wide variety of uses.  

This item transmits everything it perceives to its other half - the alibi-archive.

He reached down and pulled out the control bud on his Companion that turned on the external speaker. "You do it."

"My pleasure," said Hak, through the cochlear implants, then, switching to the speaker -

Reuben looked down. The voice was coming from the strange implant on Ponter's left wrist. "Talk to the hand," the implant said.

From Hominids (Neanderthal Parallax), by Robert J. Sawyer.
Published by Analog Science Fiction in 2003
Additional resources -

His Companion's scanners perceived everthing within a couple of paces; it only needed its directional lens uncovered when looking at an object outside its scanning range.

Compare this to the monitor beads from Frank Herbert's 1977 novel The Dosadi Experiment.

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Additional resources:
  More Ideas and Technology from Hominids (Neanderthal Parallax)
  More Ideas and Technology by Robert J. Sawyer
  Tech news articles related to Hominids (Neanderthal Parallax)
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