http://www.youtube.com/watch?v=3qLlVBcYUo4
Here's a recording of the siren. Sounds kinda high pitched than usual. Read video description for more information.
The siren is connected to some timer switch thing witch is this:
To activate the siren, they must switch to 60 minutes. It only activates the siren for about 4 minutes of attack. That's weird that they install the switch timer thing that programs the siren to sound 4 minute of attack.
Also, the siren is connected to custom attack signal timing box thing witch is this:
Note: The cabinet does not have an ID tag.