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"Science fiction represents the modern heresy and the cutting edge of speculative imagination as it grapples with Mysterious Time---linear or non-linear time."
- Frank Herbert

Wristband Viewer  
  A device for viewing aerial surveillance images that fits on your wrist.  

Mark Marakson wants to keep an eye (in the sky) on things. He can control aerial surveillance devices (called tracer birds), and see what they can see, using his wristband viewer.

The giant mechanical bird deposited Mark Marakson on the hilltop. Mark brushed back the soft green sleeve of his upper garment and pressed several buttons on the wide bracelet he wore upon his left wrist. The bird took flight again, climbing steadily. He controlled its passage with the wristband and saw through its eyes upon the tiny screen in the bracelet's center.


(Wristband viewer from Changeling)

Technovelgy from Changeling, by Roger Zelazny.
Published by Ace in 1980
Additional resources -

Aerial surveillance has been around for at least a century and a half; in science fiction, you can go back to at least the 1928 Ray Cummings novel Beyond the Stars; see the Raytron Apparatus.

Compare to the Wrist Search Display from A Matter of Size (1934) by Harry Bates, Wireless Wrist Intercom from The Shape of Things To Come (1936) by H.G. Wells, Reserve Bracelet from Plague (1944) by Murray Leinster, Tattletale from The Game Players of Titan (1963) by Philip K. Dick, Implant-Watch from Cloak of Anarchy (1972) by Larry Niven, Predator Wrist Display from Predator (1987) by John McTierna, Wrist Command from Tides of Light (1989) by Gregory Benford, Tracking Bracelet from Shadowspeer (1990) by Patricia Jo Clayton, Inertial Bracelet from Psychohistorical Crisis (2001) by Donald Kingsbury, Command Bracelet from Sagramanda (2006) by Alan Dean Foster and the Wristpad from New York 2140 (2017) by Kim Stanley Robinson.

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Additional resources:
  More Ideas and Technology from Changeling
  More Ideas and Technology by Roger Zelazny
  Tech news articles related to Changeling
  Tech news articles related to works by Roger Zelazny

Wristband Viewer-related news articles:
  - BAE Spider Robot Wrist Watch Monitor
  - Flexible OLED Wrist Display Like Pip-Boy
  - Army Wrist Display Uses 4.3 Inch OLED
  - The Ultimate Wrist Watch Pip-Boy-style
  - USAF 'BATMAN' Wrist Display
  - Neptune Duo Smartwatch Wearable Wristband
  - FlexEnable OLED Bracelet SmartPhone Concept

Articles related to Surveillance
Amazon One Is Frank Herbert's Palm Lock
Who Needs Dogs? Trained Bees Detect Explosives
Government In-Home Surveillance - Yes! Say Third Of Under-30 Adults
New Train Station Offers Minority Report-Style Signs

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