Alerting Communicators of America Sirens

Allertor 125
This siren is identified by its periscope-like horn on top and the chopper being underneath. In terms of sound, it uses a gas engine like the ones used in leaf blowers. Like other sirens in the range, it will coast to a stop instead of coming to an abrupt stop when shut off.
Sample video: https://www.youtube.com/watch?v=em5-ct2C6Tk

AL-6000
Quite similar to Whelen's Vortex/R4/4000, but with rotation and a deeper sound
Sample video: https://www.youtube.com/watch?v=HAmBaQfXxME

Penetrator 50 (aka "ASC T-135")
Was one of the loudest sirens still in production until they were completely redesigned. Had been easily recognized by being basically the ACA Cyclone turned horizontally with an extra cone over it, making it enormous up close. These were carried over when ACA became American Signal Corporation.
Sample video: https://www.youtube.com/watch?v=ZlNx_KOA-gA

Cyclone 125
One could almost call it the vertical version of the P-50 above, but its design is pretty iconic with the cone on top and the grill-like intake design.
Sample video: https://www.youtube.com/watch?v=yEONvTjUBvw

Hurricane 130 MK-2
Was probably among one of the company's top sellers, it was intended to compete with Federal Sign and Signal's Thunderbolt siren and can easily be identified by its rounded shape and double-throat design. Much like the Thunderbolt, it uses a blower and has a more raspy sound. The MK-1 version of the siren, much like other companies' previous versions of their sirens, were square-horned, and thus much rarer.
Sample video: https://www.youtube.com/watch?v=5ZhaXuDlJZ4

Penetrator 10/15/20
Basically identical with very little to tell them apart, unlike the P-50. They were also carried over, but were renamed the RM-130 with a slight redesign.
Sample video: https://www.youtube.com/watch?v=fUZpfQWTkNM

Banshee 115
Sort-of resembles a state trooper's hat with an extra skirt underneath. Also resembles the Sentry 3V8.
Sample video: https://www.youtube.com/watch?v=PDCfYYxTrsE

Super Banshee
Like multiple Banshee 115s on top of one another. Pretty easy to recognize if you can find one.
Sample video: https://www.youtube.com/watch?v=SouHxEp-w48