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This is an old gadget from 1987: A TI-2100 - a small card-size digital organizer and data bank, that holds contacts and phone numbers, with a clock and calendar, and a calculator. It has a screen similar to a digital watch or LCD calculator.
This was from a time of electronic versions of a paper Day-Timer planner and Rolodex, just before PDAs like the Palm Pilot and pocket computers running Windows CE, and way before modern iPhone and Android smartphones with their built in apps for email, contacts and calendars.