They're 2.4G Wifi, but I can't get too bothered about that. I've optimized my coverage with multiple, decent APs, so it seems silly not to use it. I'm jaded on Z-Wave after I had multiple GE Z-Wave switches just burn out on me after a couple years. I've also retired my Samsung Smartthings and Hue hub, and I don't want to buy another hub for a few lights. I also can't see paying $30+ for a light switch; the Kasa units are frequently on sale for a reasonable $10.