Could anybody recommend a WiFi siren, which is supported by OH and does not require any hub?
Is zigbee possible for you?
Then I can highly recommend this one as it even has a small Lithium-Ion-battery as backup. And it can report an AC-disconnect.
Zigbee siren
Here you can see how it looks like when opened:
Pic from inside
Almost the same exists for Wifi (Tasmota flashable) too, but I have no experience with it.
tuya siren (tasmota flashable)
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Thank you, but Zig Bee or Z-Wave are no option. I would have to install another gateway, because is far away from the controller.
Have you seen the last link? It’s tasmota flashable, so plain Wifi. But I never tried it. But I just ordered one and will see…
or
https://www.amazon.de/VisorTech-Alexa-Sirene-WLAN-Outdoor-Sirene-ELESION-kompatibel/dp/B08VF6382X/
thx. Do those work with OH?
Axis has an MQTT Interface.
Visortech: I don’t know if it has an open interface. At least it is wifi based and comes with an app. I am 100% sure you’ll find a way to integrate it 