The German Feuerwehr still uses the -really loud- compressed air sirens

https://youtu.be/AsOJx8cZ980

https://youtu.be/sYkvWbZLywc

as it


There are different police sirens in towns and outside.

inside:
https://youtu.be/HqmNOf7AQUk

countryside:
https://youtu.be/imnonFNsfas


the mechanical horn of the 40ies and 50ies:

https://youtu.be/ieebdtK_3LU


About this topic there are masses of experts and freaks, as you can see on YT.
For details of German police I can ask my brother-in-law.

A mobile one of the West German civil protection:

https://youtu.be/k4152aMXtuI


This kind of hand sirens were used by the air raid protection in WWII, but they are still existing in many fire stations:

https://youtu.be/cMbi8sLQajw

At my Bundeswehr time a moron has used it in our sleeping room - terrible (for our ears and his nose)