This is essentially a bass guitar with distortion with three layers of notes, merged together to make a "siren" of sorts. It can be used as a fire alarm, or maybe an alarm on a spaceship or UFO. 緊急報警 聲道:2 類型:mp3 Warning、Alert、System、Alarm、Fire、Emergency、Siren 警告、警報、系統、報警、火、急、siren 資料來源:freesound ( https://freesound.org )