I have been using the Intermediate Master Smart Wi-Fi Switch for 6 months to open/close my electric metal shutters via WiFi (connected to the MASTER Smart Home app for Android).

Positives:
- It is small in size and fits behind the shutter switch (which is why I chose it).
- It has a timer for automatic opening/closing of the shutters at 0/100% (I operate it manually).
- It notifies me when there is a power outage or when it disconnects from WiFi.
- It notifies me when someone opens or closes the shutters from the switch (not from the app).
- Initially, it was a bit difficult to connect to the app (after 3-4 attempts), but since then it has been working correctly (rare disconnections, but it reconnects immediately).

Negatives:
- It costs almost 80€.
- My neighbor bought a similar product from another company for only 16€, which has been working for over 2 years without any problems and has a richer menu (with percentage of shutter opening/closing, not just 0/100%).
- The only drawback of the 16€ product is that it is slightly larger in size (1 cm perimeter/for American electrical boxes) and does not fit directly behind the switch (requires some adjustment).