Mobile app and radio: what they have in common

1. Step 1. Mobile app — uses — Smartphone. For a smartphone.
2. Step 2. Smartphone — has part — Vibration motor. A tiny motor produces the vibration alert.
3. Step 3. Vibration motor — is part of — Pager. Vibrating alert.
4. Step 4. Pager — uses — Radio. Radio reception.

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