ALL OK. THANK YOU.
I have received the switches within two weeks from the order. They were properly packed, all needed things, including wiring and even screwdriver were attached. The switches work properly as per description, however I was surprised, the manual switches don't operate as before, to stop the curtains in the intermediate position, you need to use either app or remote, it doesn't work with the manual switches, manually you can fully open our close only. In the later communication it appeared it was the feature of the RF remote option.