As in rural Germany, France, and Portugal, sirens are in common use by volunteer fire departments in Poland. As was the custom in Germany before the war, two sirens with different pitches were often used to distinguish a fire call from a civil defense alert. In Poland, however, the fire siren was usually high pitched unlike the German deep-tone (tiefton) fire siren. In this video, the two sirens are wired together. You can find many Polish siren videos using the search term "OSP syrena."
https://www.youtube.com/watch?v=YkpVu6O0-JM