Karaoke and electric fan: what they have in common

1. Step 1. Karaoke — has part — Microphone. A microphone.
2. Step 2. Microphone — is part of — Smart speaker. An array of microphones.
3. Step 3. Smart speaker — is part of — Smart home. The control hub.
4. Step 4. Smart home — has part — Thermostat. A smart thermostat.
5. Step 5. Thermostat — is part of — Convection oven. A thermostat.
6. Step 6. Convection oven — has part — Electric fan. A fan circulates the air.

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