Bike light with dynamo and router: what they have in common

1. Step 1. Bike light with dynamo — has part — LED. An LED.
2. Step 2. LED — is part of — Pulse oximeter. Red and infrared LEDs.
3. Step 3. Pulse oximeter — is part of — Smartwatch. A heart-rate and SpO₂ sensor.
4. Step 4. Smartwatch — has part — System on a chip (SoC). Inside is a system on a chip.
5. Step 5. System on a chip (SoC) — is part of — Router. A packet-processing processor.

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