How does an alarm clock make sound?

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  1. #speak
  2. #laugh
  3. #simple
  4. #sleeper
  5. #nature
  6. #clocks
  7. #sounds
  8. #sound
  9. #alarm
  10. #while
  11. #noises
  12. #battery
  13. #beeping
  14. #buzzing
  15. #other
  16. #powered
  17. #novelty
  18. #digital