I saw it on a home automation website but could not find the answer.
You can use audio files that you load into it.
Is that a good “doorbell” as well? Or do you have to use it as one or the other?
You can use it as both.
It has a remote button you can use for the doorbell.
It can be loaded with a ton of different audio clips for different things; triggering when someone comes home, when a door is opened, when the washing machine is done, etc.
Where do you get the sound clips?
Read the second post on that thread I linked to.
He gives all the information you will need.