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"At its best, SF is the medium in which our miserable certainty that tomorrow will be different from today in ways we can't predict, can be transmuted to a sense of excitement and anticipation, occasionally evolving into awe."
- John Brunner

Command Bracelet  
  A wrist-borne device with a variety of capabilities.  

As soon as he saw his pursuer take out the pocket scanner, Taneer activated several programs built into his command bracelet. So he was ready when the scanner found the taxi's code for its door locks and a soft buzz indicated that they were being deactivated. Before the tall man could grab the door handle, the scientist hit a control that instantly reprogrammed the coding. An electronic click sounded, indicating that the doors had relocked themselves.

From Sagramanda, by Alan Dean Foster.
Published by Pyr in 2006
Additional resources -

Here's another quote:

The only sign of modernity on his body - indeed, in the entire room - was the gold-tinged control bracelet encircling his left wrist and the chronometer on his right...

"Tea?" asked his host. When Sanjay nodded affirmatively, Pandit whispered to his bracelet....

Compare to the tracking bracelet from Shadowspeer (1990) by Patricia Jo Clayton, the inertial bracelet from Psychohistorical Crisis (2001) by Donald Kingsbury and the wristband viewer from Changeling (1980) by Roger Zelazny.

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Additional resources:
  More Ideas and Technology from Sagramanda
  More Ideas and Technology by Alan Dean Foster
  Tech news articles related to Sagramanda
  Tech news articles related to works by Alan Dean Foster

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