The routers can handle simultaneous 2.4GHz and 5GHz connections, but the devices you connect to it can only use one of those frequencies at a time.
@YetAnotherAcc is right!
There's two available frequency bands - that's the 2.4Ghz and 5Ghz band. Devices seem to want to latch onto the 5Ghz Network by default.
The 5Ghz band allows for faster WiFi speeds at shorter distances. The strength of the signal weakens the further you are away from the modem.
They both share the same WiFi password, but the Network names are listed as either 2.4 or 5.0.
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