In case you didn’t know, there is a Dual Headed Whelen 3016 and one head is painted Dark green and the other is painted brown , it is located in Canon Beach, Oregon and they test with “Cows Mooing”, I will provide a link about its system and an image to elaborate the siren. I’m not sure what controller it is but it’s a high chance it’s an 864 by the looks of them. But the system consisted of scrap or replaced sirens.
https://medium.com/west-coast-life-fran ... 30f0e683f1