The latest generation of Wi-Fi technology that is supported by the device. The generations returned by this capability are mostly as designated by the Wi-Fi Alliance (https://www.wi-fi.org/news-events/newsroom/wi-fi-alliance-introduces-wi-fi-6).
-1 = no WiFi support
3 = Wi-Fi 3rd Generation aka Wi-Fi 3 aka 802.11g
4 = Wi-Fi 4rd Generation aka Wi-Fi 4 aka 802.11n
5 = Wi-Fi 5rd Generation aka Wi-Fi 5 aka 802.11ac
6 = Wi-Fi 6rd Generation aka Wi-Fi 6 aka 802.11ax
ScientiaMobile has added an additional generation designation for 802.11g (level 3) since our device database contains some older devices that solely support this technology.