They don't have wifi, unless you mean the z-wave protocol, which is a separate wireless protocol.

You can add a zwave controller that translates ip commands from a home server to zwave commands, but it can be wired or wifi (or usb).

You can also directly program zwave "scenes", which work directly between the z wave devices without needing a controller. Like a direct remote control.

I did mean z-wave. I am not sure of what acronym to call that by. I guess I could have just said radio/wireless?

Edit: Regardless of what I meant, I think you proved I should look more into these. Thanks!

It's proprietary wireless, usually people just say zwave.

My point was that it's not like most iot devices that try to find an open internet connection to phone home. They're 100% as isolated as you want them to be.

Check out Inovelli[0]. They are the darling child of the Home Automation subreddit. I have a few of the last generation switches and they do perform well and have a great feature set for the price.

0: https://inovelli.com/