5Ghz N. Your notebook has the Broadcom BCM43142 80211b/g/n 1×1 WiFi Adapter It only works on the 24 GHz wireless band Anytime you see a wifi N adapter with a suffix that ends in b/g/n that means it is a single band (24 GHz only) wireless network adapter Dual band wifi N adapters have suffixes that end in a/b/g/n or a/g/n.
Higher frequencies like 5GHz and 60GHz have far shorter effective ranges than 24GHz Everyone within a network’s range and a compatible WiFi device can detect the network and attempt to.
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The 5GHz band which is the newer of the two has the potential to cut through network clutter and interference to maximize network performance Which means this band will be better for things like reducing game lag 5GHz more channels for communication and usually there aren’t as many competing devices on the newer band But by design 5GHz can’t reach as far as the 24GHz.