What are these WiFi frequencies for?

I have three of these units as dumb APs:
youhua_wr1200js

If I run this command, I get a list of all these WiFi Freq:

root@DUMBAP_1:/etc/config# iwinfo phy1-ap0 freqlist
  5.180 GHz (Channel 36)
  5.200 GHz (Channel 40)
  5.220 GHz (Channel 44)
* 5.240 GHz (Channel 48)
  5.260 GHz (Channel 52)
  5.280 GHz (Channel 56)
  5.300 GHz (Channel 60)
  5.320 GHz (Channel 64)
  5.500 GHz (Channel 100)
  5.520 GHz (Channel 104)
  5.540 GHz (Channel 108)
  5.560 GHz (Channel 112)
  5.580 GHz (Channel 116)
  5.600 GHz (Channel 120)
  5.620 GHz (Channel 124)
  5.640 GHz (Channel 128)
  5.660 GHz (Channel 132)
  5.680 GHz (Channel 136)
  5.700 GHz (Channel 140)
  5.720 GHz (Channel 144)
  5.745 GHz (Channel 149) [restricted]
  5.765 GHz (Channel 153) [restricted]
  5.785 GHz (Channel 157) [restricted]
  5.805 GHz (Channel 161) [restricted]
  5.825 GHz (Channel 165) [restricted]

If I try to us anything above 48, wireless doesn't work. What are all the additional frequencies for then?

different countries are permitting different radio frequencies, it might also be DFS related.
or you haven't specified any country in your radio setup at all.

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This is the restricted operation that you get when no country is specified. In that case, only the limited set of channels and modes that are legal in all countries can be used. Place an option country 'XX' in /etc/config/wireless under both wifi-devices, replacing XX with your two-letter country code.

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