Raspberry Pi and headphones: what they have in common

1. Step 1. Raspberry Pi — has part — System on a chip (SoC). SoC Broadcom.
2. Step 2. System on a chip (SoC) — is part of — Smartwatch. Inside is a system on a chip.
3. Step 3. Smartwatch — evolved from — Fitness tracker. Tracker functions moved into watches.
4. Step 4. Fitness tracker — has part — Bluetooth. A link to the phone.
5. Step 5. Bluetooth — is used in — Wireless earbuds. Bluetooth.
6. Step 6. Wireless earbuds — evolved from — Headphones. Wireless headphones.

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