This is a 3" 5/6 port "ACA style" siren. It is designed very similarly to the 9/12 and 8/12 port rotors A.C.A. (now ASC) used on the Allertor and
...Show more Banshee, and later the Penetrator (though never made in 8/12 port, only 9/12). I recommend using this motor with it, but any motor with a 0.091 shaft should work.
https://www.jameco.com/z/MS5N-1885-R-12-Volt-DC-Motor-740mA-9820-RPM_232022.html
Video:
https://www.youtube.com/watch?v=FSjRAUovvA8
