Doorbell /Homebase alarm query

I have the battery doorbell and Homebase 2 system. Could somebody explain the Alarm element of the system. I can’t find anything in the documentation or the app that explains what it is, how it works or how to use it.
Thanks for your help.

From what I seen in settings you could use automation. So when doorbell detect motion or when press you can set Homebase alarm to go off. Don’t really see the need for this.

Thanks for the explanation. Don’t think it’s something I’d use though.