I’ll add a few more devices to the list → wifi security camera, wifi thermostat, wifi garage door opener, wifi security cameras, wifi door locks, wifi refrigerator, wifi washer, wifi dryer, wifi portable AC units, wifi lamps, wifi light bulbs, wifi on/off switches, etc, etc. And although wifi routers now support both the faster 5 GHz connection beside supporting the 2.4 GHz wifi connection, almost all the wifi-based devices around the house that I mentioned above only works on 2.4 GHz wifi. So sometimes people just use the 2.4 GHz wifi band on their router for everything, including laptops and PCs and smart phones and tablets, even though these devices can connect to the 5 GHz band just fine.