Meet Shuttle from Sonicco: a smart door wedge that closes your fire door when there is an alarm. You can install it in a few minutes and run it on battery. When an alarm goes off, the device allows the door to close automatically.
More gadgets like this: here
Thanks to SonicEar robotic ear technology, actions can be performed when a specific sound goes off. Expected to ship in September. More info is available here.
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