Air raid sirens were developed in the early twentieth century as mechanical warning systems and became widely known during the Second World War, when cities used them to warn civilians of incoming air attacks. The rotating wail was designed to carry for miles and be impossible to confuse with other signals. After the war the same sound stayed in civil defence, weather warning and military use, and recordings of it spread through films, games and online sound libraries as the universal audio symbol for an air alarm.
关于此声音
A loud air raid alarm siren sound effect with rising and falling wails, used in videos for emergency warnings, attack alerts and dramatic danger scenes.
This is a full air alarm siren lasting fourteen seconds, built from a continuous rising and falling wail that repeats without pause. The tone starts urgent and grows more intense as the pitch climbs, holds, then drops, creating that classic air raid warning pattern. It instantly signals danger, evacuation and incoming threat, even with no picture on screen. Listeners feel tension right away because the sound is linked in films, games and news footage to bombings, severe weather and emergency alerts. It works as a serious warning cue or as an exaggerated dramatic alarm.
