What siren tone is this?

I don't know what the tone is called, but they are used from time to time by Boston PD.
 
Its the Fed Sig pursuit tone.
 
The overall scheme is a setting on the siren that cycles through multiple tones.

We used to use "Touchmaster" sirens on our vehicles, and this tone was labeled as "high/low"... however, it is also similar to a phaser/hyper-yelp tone.

We still have the siren in one of our vehicles... and, as that is the reserve rig, when newer drivers operate it, it causes confusion.
 
The tone is part of the "SCAN" sequence of tones on Federal Signal Unitrol Touchmaster sirens. You can not use this tone by itself - it is only played when in the scan mode.
 
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