What is 433MHz RF transmitter and receiver?

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Tags

1. #signals
2. #serial
3. #transmits
4. #specific
5. #433mhz
6. #operates
7. #obstruction
8. #through
9. #which
10. #connected
11. #receiver
12. #there
13. #receives
14. #transmitter
15. #travel
16. #antenna
17. #frequency