Most modern routers are what we call ‘Dual Band.’ This means they broadcast both 2.4GHz & 5GHz.
Due to its design Cocoon will only work when connected to your WiFi over a 2.4GHz band.
2.4GHz travels a lot further than 5GHz, it also passes through obstacles (walls Etc.) much easier than a 5GHz band. This means Cocoon is can be placed further away, or even in a different room to your router.
If you have two WiFi networks, when setting up your Cocoon you should take care to ensure you connect your mobile device to the 2.4GHz network. If you only have one WiFi network, Cocoon should connect without trouble.