Most wifi access points these days offer a "Guest" SSID for guests to access. These are perfect for segregating all the IOT - Internet of Things devices you have in the house such as smoke detectors, thermostats, doorbells, cameras, dishwashers, toasters, TV's and cell phones that have zero business on the inside trusted side of your firewall. You can set that guest network up easily in most devices and allow it to use only the lower 2.5 setting, while the trusted devices that should be connected inside your firewall such as laptops, and desktop computers can have settings other than 2.5 without knocking your station off line.