Those of you who have a simple switch, it is necessary to buy it! It does what it says! However, I needed an electrician to install it.

I bought it to automate electric blinds with a Somfy motor and for now I am very disappointed. It was installed, connected briefly to my network and then disappeared. I tried to do a factory reset according to the instructions and its access point no longer appears. If you have more complex mesh networks, be careful, unfortunately I read after the fact that it is problematic with such networks.
Note that this particular model has been discontinued by Shelly and has been replaced by the Shelly Plus 2, which has the latest ESP32 chip.

P.S. After contacting Shelly, it seems that the one I got was faulty. In any case, I had already bought the corresponding Sonoff, with which I have no problems after a month of use.

The best intermediate switch currently available for controlling blinds/curtains/awnings. To avoid rewriting, I will provide the comparison I made with the Sonoff Dual R3:
https://www.skroutz.gr/s/29373670/Sonoff-Smart-%CE%95%CE%BD%CE%B4%CE%B9%CE%AC%CE%BC%CE%B5%CF%83%CE%BF%CF%82-%CE%94%CE%B9%CE%B1%CE%BA%CF%8C%CF%80%CF%84%CE%B7%CF%82-Wi-Fi-%CF%83%CE%B5-%CE%9B%CE%B5%CF%85%CE%BA%CF%8C-%CE%A7%CF%81%CF%8E%CE%BC%CE%B1-DUALR3.html#sku_review_2136596

Excellent. I have installed four. Two on roller blinds and two on double switches, and they work both with the switches and through Google Home. I installed them after digging the boxes because my existing Legrand Valena switches couldn't fit. Where there was no neutral socket, I pulled the neutral from the box above. Also, the Shelly app is very easy to use.

Excellent range. I have installed 4 rolls in my house and control them through Alexa. It fits in every old switch, but it requires a neutral wire from the socket. Small tip: I made the connection with the neutral wire inside the socket and ran a cable to the switch through the wall. The Shelly application is very easy to use, you can easily adjust everything.