This is a custom siren! It's a dual tone 2001 siren, the chopper port is a 4/6, but if it was a real siren it would be 8/12. You could print the chopper model with the ports separated and could be glued together, or the chopper model that is completed with both chopper ports on. The 2001-16T uses a r130 DC motor just to let you guys know.
The author marked this model as their own original creation.