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A few days ago we saw an iPhone case with a built-in pepper spray. The Coyote Case isn’t as aggressive, but it was invented with the same idea in mind: to protect the owner of the phone as well as it protects the phone itself.
Builder Matthias Wandel is known for his awesome moving marble contraptions, which certainly can make some noise. But now, he’s gone and taken his DIY skills and applied them to a much louder noisemaker – his own air raid siren.