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!)
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Gaia - Why Stop With Just The Earth?
'But the stars are only atoms in larger space, and in that larger space the star-atoms could combine to form living matter, thinking matter, couldn't they?'
Microsoft VASA-1 Creates Personal Video From A Photo
'...to build up a video picture would require, say, ten million decisions every second. Mike, you're so fast I can't even think about it. But you aren't that fast.'