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UVB-76 (Russian: УВБ-76; see § Name and callsigns for other callsigns), also known by the nickname “The Buzzer”, is a shortwave radio station that broadcasts on the frequency of 4,625 kHz.[1][2] It broadcasts a short, monotonous buzz toneⓘ, repeating at a rate of approximately 25 tones per minute, 24 hours per day.[1] Sometimes, the buzzer signal is interrupted and a voice transmission in Russian takes place