Ive tested most of these doorbells now Ring Hik Dahua Chinese cheapos, and they do work 8 or 9 times out of 10, and so the alarm should be fine ......most of the time.
Seriously though, the doorbells are nothing like the adverts would have you believe, my ring doorbell missed so many parcel deliveries and I know that the postie press the button because I have hard wired reliable CCTV. And it alerted falsely so many times even on the lowest setting that I couldn't use the motion detect at all. I do not understand why anyone would have a doorbell, understand that it doesn t always work, and then think I know, Ill use their alarm to protect my home. Its sods law that it will let you know just as the burglar is leaving, thats what the doorbell does.