Pager receiver circuit and fitness tracker: what they have in common

1. Step 1. Pager receiver circuit — is part of — Pager. It receives messages on a dedicated frequency.
2. Step 2. Pager — has part — Liquid-crystal display. The message appears on an LCD.
3. Step 3. Liquid-crystal display — evolved into — Display. The first smartphones had LCD screens.
4. Step 4. Display — has part — Touch layer (capacitive). Under the glass is a touch layer that registers touches.
5. Step 5. Touch layer (capacitive) — is part of — Smartwatch. A touchscreen.
6. Step 6. Smartwatch — evolved from — Fitness tracker. Tracker functions moved into watches.

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