It does not require an internet connection but a wifi connection so that configurations can be made from mobile. Updates and remote access require an internet connection.
The Smartvest does not have a direct wifi connection. It needs a network cable from the router to the control panel. The control panel is then programmed from a mobile with internet. The external alarm is only sent via the Internet; unfortunately, it is not possible to send an alarm by telephone in Switzerland. I can access the system at any time via the Internet, see which window is open, whether an alarm is pending or switch the system on and off.