Civil defense

Warning the population in case of a coming disaster

• 
  Thunderbolt 1003
  Federal Signal
• 
  AL-8000
  American Signal Corporation
• 
  Flood siren
• 
  SD-10
  Federal Signal
• Warning-Signal of a German Siren

France

• 
  Beginning of the alert: the sound warning is made of three sequences of sound going up and down lasting one minute, separated by a silence lasting five seconds. End of the alert: continuous signal of 380 Hz, lasting thirty seconds.
• 
  In case of a signal generated by electronics, a cycle is made of a two-second rise from 300 Hz to 600 Hz, then a two-second decrease back to 300 Hz; in case of an electromechanical siren, a cycle is made of seven second where the motor is on (the sound rises to 380 Hz), then five seconds where the motor is shut down.

Switzerland

• 
• 
  General Alarm
• General Alarm
• 
  Water Alarm
• Water Alarm