What does the scan button do on a radio?

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Tags

1. #through
2. #driver
3. #radio
4. #which
5. #having
6. #frequencies
7. #primary
8. #safety
9. #manually
10. #button
11. #sweeps
12. #signal
13. #looking
14. #performing
15. #broadcast
16. #feature
17. #relieves
18. #takes
19. #driving
20. #sense
21. #attention