Hi Ernest,

There's only 2 WiFi frequencies right now in use, 2.4Ghz and 5Ghz.

The lower frequencies have better penetration and therefore can achieve longer distances than higher frequencies which have higher transfer rates but lower penetration and less reach.

This is why the SiB is 2.4Ghz because the purpose is to get better coverage and since the transmission of data is very low, its also fine.

5Ghz is not supported by the SiB and its the same for many WiFi IoT devices.

So we're not talking about the "generation" as you've indicated with 4G or 2G, but rather the frequency that's important.

Your router "should" support 2.4Ghz, practically every router does, but if it doesn't, then yes, you will need to get one that does.

Regards,
Mark