Open your command prompt and write this command
netsh wlan show drivers
It will give you lots of information look for
Radio types supported
If Radio types supported line shows these network modes
802.11g and 802.11n
then our Laptop has 2.4 GHz network capability only.
If Radio types supported line shows these network module
02.11a and 802.11g and 802.11n
then your laptop support both 2.4gh and 5gh wifi band.
if you want to know more about these network module then you can check this .
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