Place it at the start of a horror sequence, before any dialogue or action, then follow it with FNaF 2 Hallway Ambience for the empty corridor that follows and Phasmophobia Ghost Attack when the threat finally appears.
关于此声音
This 20-second clip is the sustained, mechanical warning siren from The Purge film series, a long wail that sounds like a public emergency alert. It feels ominous and unsettling, building dread instead of delivering a sudden scare, and it makes an ordinary night feel dangerous. In the films, the siren announces the start of the annual Purge, when crime is legalised for one night.