Wth! Aeon Siren Gen5

It could definitely happen again. I’m not saying it will, but it can. Search the forums for “poltergeist” and you’ll see multiple reports, including some for sirens going off.

This is one of the reasons why the official SmartThings terms of use says:

https://www.smartthings.com/terms

As part of using the Services, you may create connections between various physical devices (which may be provided by SmartThings or by others), third party services, and the Services. You acknowledge and agree that you will not connect any physical devices or third party services to the Services (or otherwise use the Services) in a manner that could be dangerous to you or to others, or which could cause damage to or loss of any property (whether real, personal, tangible or intangible). For example, you should never connect heavy machinery, power tools, medical equipment, or other similar devices to the Services. For more information, please visit our Product Guidelines Page.

And in the Product Guidelines:

SmartThings allows for the control of electronic devices through pluggable outlets and supported third party switches, outlets, relays and controls. Where possible, SmartThings has worked to ensure message delivery and control reliability, but many factors can impact this, including electromagnetic interference, solar flares, wireless and cellular connectivity, and the natural complexity of software instructions that might be in direct conflict caused by SmartApps or by end users.
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These and other issues can cause commands to not be delivered, to be delivered repeatedly, or to be delivered in rapid succession.
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Therefore, do not use SmartThings to control any device that may have an impact on health, safety, security, property, or financial interests, or where the device is sensitive and could be damaged by power cycling or power surges.
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For example, do not control medical equipment or expensive electronics with SmartThings.

And don’t hook up anything that might cause hearing damage to your dogs if it goes on and off repeatedly without your expecting it to. :dog:

All of this is in the fine print, obviously, but it is what it is.