On the first day after installation, I discovered a defect. At a low fan speed, the fan runs for about 20 minutes and stops spinning, it helps to completely turn off the device from the outlet and then turn it on after 2 minutes and everything repeats again. At the first speed, it seems to work constantly and does not turn off. So far, I had to remove the fan and close the hole in the wall for further proceedings. The device turns out that it is impossible to use, probably you need to change the fan and set your own automation.