Doorbells!

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Across
  1. 2. The metal plates within the doorbell.
  2. 3. The source of power for a doorbell.
  3. 4. Physics _ _ _ _ _ Technology.
  4. 6. A coil with current running through it.
Down
  1. 1. Freebie: Doorbell
  2. 2. A common doorbell brand with a camera.
  3. 5. the sound a doorbell makes.