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In page Civil defense siren:

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In France, the emergency population warning network is called the Réseau national d'alerte (RNA). The system is inherited from the air raid siren network (défense passive) developed before World War II. It consists of about 4,500 electronic or electromechanical sirens placed all over France.[1] The system is tested each month at noon on the first Wednesday. The most common siren type is the electromechanical KM Europ eight-port single-tone siren. These sirens have a very characteristic sound: a very fast wind-up and a lower pitch than most sirens (the pitch is comparable to a Federal Signal STL-10 on a lower frequency). A recording of these sirens was used in the movie Silent Hill.[citation needed]