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What audible range can be achieved with a siren?
Does an ECN siren also have a 360° radiation characteristic?
What are the benefits of the electronic siren over the motor siren?
These and many other questions relating to the siren are answered here.
You can download datasheets, information brochures, various siren signals and other useful information here.
There are many sources in the Internet that provide information on the subject of warning the population and in particular warnings via sirens. Here are some interesting links.