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.
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.
Americans! Stay Indoors To Save Energy
'Those funny old days, when men went for change of air instead of changing the air in their rooms!' - EM Forster, 1909.
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Comercial Airlock 'Bishop' Now On ISS
'They put the bones and the glass can that had contained the soup into the double-doored partition or vestibule...'