One of my favorite pieces of technovelgy is the finger watch, which I first encountered in Robert Heinlein's excellent 1951 novel The Puppet Masters - still a great read, by the way.
"Seventeen hours" - The Old Man glanced at his finger watch and added - "and twenty-three minutes ago an unidentified space ship landed near Grinnell, Iowa."
I think that the Ring Clock is an excellent implantation of this science-fictional idea:
(Ring Clock - start at 4:00 for English)
The Ring Clock uses a lithium polymer batter, blue or orange LED, wireless charger, water resistance to 30 meters; it runs for a week between charges. It's awesome, in my opinion.
However, back to science fiction. In the intervening years I encountered an earlier use (by six months!) by HB Fyfe, in Astounding Fiction:
Crayn glanced at his finger watch as his aide fastened the cloak he had brought hurriedly after him. It was three-forty-seven, Galactic Time.
Tortoise Mobile Smart Stores
'... all round the city dozens of cars have rented out their trunks, which contain cigars and scotch and stuff.' - Karl Schroeder, 2019.
ROAM Robotics Skiing Exoskeleton
'The real genius in the design is that you don't have to control the suit; you just wear it...' - Robert Heinlein, 1959.
Technovelgy (that's tech-novel-gee!)
is devoted to the creative science inventions and ideas of sf authors. Look for
the Invention Category that interests
you, the Glossary, the Invention
Timeline, or see what's New.
Humanoid Robots Building Humanoid Robots
''Pardon me, Struthers,' he broke in suddenly... 'haven't you a section of the factory where only robot labor is employed?''
Stratospheric Solar Geoengineering From Harvard
'Pina2bo would have to operate full blast for many years to put as much SO2 into the stratosphere as its namesake had done in a few minutes.'