It says subscription-free, writes to AN SD card, and implies no cloud storage. It could very well be that it requires no internet connection, in which case the only limiter to using it in the US would be power. Either it’s battery powered, or doorbell line powered (like many smart doorbell devices in the US). Doorbell lines in the US are 12V (or 24V - I don’t remember which exactly), but if it’s battery powered I can’t see why you couldn’t use it in the US - batteries are the one truly universal international standard.

It’s probably too much to hope for zwave or something, but even if its WiFi, it looks as if they’re positioning it to be cloud-service-free. Looks interesting.