In Mt.Dora Florida they have mini electronic sirens mainly used for the blind to cross streets but can also serve as an O.W.S. because of volume control.
The look like a "Mini" gray T-Bolt.
Just think of The APEC system but in a smaller power scale.
Crude MS Paint drawing.
http://en.wikipedia.org/wiki/Mount_Dora%2C_Florida[/code]
The Question is, Does anyone know what company made this ?
I will get pictures when I move to Florida!