I have installed a few of these, but this is the first time I’ve seen a notice pop up when adding the fan “Some security features not supported. Your device has been connected, but it isn’t using the highest level of security. Use a newer Z-Wave device for the highest security.” I can’t seem to find anything that tells me which version I should get or why this is not secure. I have had these for a couple of years and just got around to installing this third one. I don’t remember getting this notice with the previous two installs.