Comment by apparent

I have wondered about this also. I noticed that some of my older plugs seem to keep on chugging even when internet is out. I am guessing they have some internal clock that they fall back on when the internet is not available. However, this would only work until the first power outage happens, at which point they would no longer know what time it is, and there would be no way to reconnect to them via the Wemo app to sync up their internal clocks.