Any siren which uses a DTH which is eligible to run locally can run locally. There’s one for a generic Z wave siren and one for the Aeotec siren.
See the following FAQ (this is a clickable link)
But then you are limited to the features in that device type handler.
Also if the cloud is down, the mobile app won’t work, so think about how you will turn the siren off if necessary.
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