That’s correct, the siren will initially add as a switch, because it can be turned on and off.
After you get it added if you want to change it to a device type handler that will give you control of more of the siren features, you can do that.
Here is the FAQ for using custom code:
And here is the thread where you can get a custom device type handler for the siren:
You can ask any follow on questions about the siren in that thread and people will be glad to help you.
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