Hi is the Federal Interceptor controller for a speaker siren. It works great and I used it for many years on our old fire truck. Our department traded in the truck and I bought the siren and controller. This is for the controller only. It is simple, clean and a blast to use for fun only. All of the wiring and the microphone are still in place. It is 12volts. E mail any questions, but you collectors know much more about this stuff than I do. These are really hard to find. Thanks and have a safe day.