Original WW2 fire-siren test

Every saturday high-noon is a short siren-test in whole Austria. There are more than 8200 sirens there which will activated at same time.
In this video i show you an old and rusty WW2-fire-siren (typ is called FmSi40 (Siemens), but only as deep- tone unit with 3 ports like here in the video!) constructed in the 30ies. (I visited this old guy 3 years ago, but it is still in function and in best condition! ;-) )
A pre-announcement:
Next saturday, the 6th of October will be a special siren-test in whole Austria with 4 different siren-signal. This important test is every year on the 1st saturday on October at 12:00 o´clock pm.
I will show you this siren-test with all important signals in complete with the same siren-type here FmSi40.