The alert was announced by audio and crewmembers were expected to take appropriate action. It could also be activated automatically based on predefined criteria, such as entering a restricted area. It could be declared at any time, by computer or any crewmember upon detecting an intruder on board.

Use and/or possession of these tones are completely legal as long as they are not broadcasted (played over Television, radio, etc.). Intruder alert was an alert status on Federation starships and space stations. The SAME Headers are valid and decode into a Civil Emergency Message for Minnehaha County SD, so please DO NOT BROADCAST THIS SOUND OVER THE AIR, as it is highly illegal and may falsely activate the Emergency Alert System. The voice-spoken message (Text-To-Speech or human) is put between the EOM tones and the Two-Tone Attention Signal. End Of Message (EOM) tones, which are the three short screechy beeps played at the end of EAS transmissions. Sound Design Voice Acting Credits Tour Press Blog Audio-Technica. Two-Tone Attention Signal, the fourth beep you hear that kind of sounds like it's from a telephone. SAME Headers, which are the first three long screechy beeps played at the beginning of EAS transmissions, and are coded with data about the emergency including the affected counties, when it will expire, the event type, and who issued it. Get red alert sound in Wav or MP3 format for free courtesy of the Free Sound.

This audio file includes all the tones and beeps you hear in real-life EAS transmissions: Red Alert Sounds Effects Sound Bites Sound Clips from Free.

These are high-quality and realistic, ideal for making EAS mocks/scenarios. These are the tones (aka Attention Signals) from the Emergency Alert System in the United States.

Red alert sound effect