UVB-76 is not quite what it seems.

UVB-76, also known by the nickname "The Buzzer", is a shortwave radio station that broadcasts in upper sideband mode on the frequency of 4625 kHz.

UVB-76, also known by the nickname "The Buzzer", is a shortwave radio station that broadcasts in upper sideband mode on the frequency of 4625 kHz. It broadcasts a short, monotonous buzz tone, repeating at a rate of approximately 25 tones per minute, 24 hours per day. Sometimes, the buzzer signal is interrupted and a voice transmission in Russian takes place.