I got a tip that this siren had a broken rotator... so I did the smart thing and set up right in front of it with no hearing protection save for my fingers. Sucks when I had to take my fingers off to fix the video, which is why the first half is in crappy quality, it was my backup camera (which I accidentally had set to VGA at the time), the other half of the video is better.
https://www.youtube.com/watch?v=OlQhnXcjKZs