If you join the Doorbell, it creates a main device that supports the Chime capability and the Tone capability. The settings allow you to specify a default sound, volume, light effect, repeat, repeat delay, and intercept. Rule machine supports that capability and allows you to play sounds on the fly by specifying the sound number.
It creates a child device for a siren that supports the alarm capability and has the same settings as the chime. It also creates a child button device for each paired button and each of those devices also have those settings.
if you pair the Siren it creates a main device that supports the Alarm capability and a chime device that supports the Chime and Tone capabilities. Both of those also have their own sound and light settings.
If you purchase the siren and want to be able to configure the button you'll need to switch to the Doorbell handler.
