A rare example of early wearable technology is available to purchase on auction website ComicConnect. The WristMac debuted in 1988 and could communicate with the Mac Plus, Mac SE or the Mac II. It was also instrumental in sending the inaugural email from space aboard the Atlantic Space Shuttle.
https://www.notebookcheck.net/Seiko-WristMac-Macintosh-compatible-wristwatch-that-helped-send-the-first-email-from-space-goes-up-for-auction-33-years-after-its-release.580867.0.html