Awesome rare deep sounding siren: Old German WW2 siren in ACTION

Now it is time to present you a further interesting close up siren video of an old german Elektrorsiren from WW2times still in function. Location is in Austria. (here you can see, hear only the lowtone unit with big 3 ports ). And so it has a very deep sirensound and this is a curious and scary thing when it runs. Sirentonefrequency is at 145 Hz The testsignal is called alarm (only available in Austria) and it has the purpose to warn the population in case of dangers like e. g. chemical accidents