Channel/End-of-Transmission Tone (TOT beep)
These platforms provide royalty-free audio files like "roger beeps," radio static, and dispatcher chatter in MP3 format: police walkie talkie sound message tone link
: A short beep every 10–15 seconds indicating that a specific signal (like Signal 91) is in effect, warning all units to avoid non-emergency transmissions . Emergency and System Tones " radio static