The important question? I own Sonofo 4ch and since you stated that the device can work without WiFi, it suited me because I have no wifi in the place where I use it. I connected it to wifi and programmed it to work every day. However, one day does not work, on Sundays, which is the only day with no wifi signal. I assume that the question is, how much Sonoff device can work without the Internet if there is no power failure?