What is the ringtone announced at the airport called?

Song name: Commonly used prompt tones at the airport (21-second ringtone version) gt; Singer name: Mobile phone ringtone 1

Commonly used prompt tones at the airport (21-second ringtone version) Commonly used at the airport Prompt Tone (21 Seconds Ringtone Version) This song is sung by the singer Ringtone 1. The total duration of the song is 00 minutes and 21 seconds. The song is included in the album "Mobile Ringtone/" released by Cellphone Ringtone 1 on 2017-11-29. "Selection of SMS Sounds", if you think the lyrics of Commonly Used Airport Announcements (21-Second Ringtone Version) are well written, please share this song with your friends*** and read Commonly Used Airport Announcements (21 Seconds Ringtone Version) Second ringtone version) lyrics, let's support the singer's mobile ringtone 1!

Commonly used prompt tones in airports (21-second ringtone version). The prompt tones in airport broadcasts generally have four tones, namely Didi Didi. In music knowledge, are they 1234, or Dou? Come to Mifa?

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