If it wasn't for the fact that I was just in Bellewood a month ago, I wouldn't believe that it was a Sentry I was hearing in this clip. I have NEVER heard a Sentry siren wind up so fast and peak at such an ear shattering screech. Here is a picture of the siren, note the custom work extra skirt that it has.
Dave
Picture
http://youtube.com/watch?v=KSLSsWlbZYk&feature=related
Video