@Pietertje 

If you need to use the smart plug in a location without Wi-Fi, it should be set up in that location and must not experience any power loss after configuration. In the event of a power cut, you will need to reconnect the plug to the internet to resync the device's time. Otherwise, time-related features will not function.

In simpler terms, the smart plug requires internet access to obtain and calibrate its time. Once this is complete, the scheduled settings will continue to run even if both Wi-Fi and internet connections are lost. The device's time will be erased when the smart plug restarts, and it won't be accurate without internet access, which will also prevent the schedule from working. Additionally, be aware that time discrepancies may occur if the plug is used without internet access for an extended period. In such cases, the plug must reconnect to the internet to recalibrate its time.

By the way, if you need to adjust plug settings, your phone and the plug should be on the same WiFi network.