[1][2] It broadcasts a short, monotonous buzz toneⓘ, repeating at a rate of approximately 25 tones per minute, 24 hours per day.

They consist of a callsign (read out twice), a codephrase (Russian: ОБЪЯВЛЕНА КОМАНДА, romanized: OB'YaVLYeNA KOMANDA, lit.

Example of such a message: Distant conversations and other background noises have frequently been heard behind the buzzer; this suggests that the buzzing tones are not generated internally, but are produced by a device placed near a live and constantly open microphone.

[21] One such occasion was on 3 November 2001, when a conversation in Russian was heard:[10] In September 2010, several unusual broadcasts were observed; these included portions of the buzzer being replaced with excerpts from Tchaikovsky's Swan Lake.

[23] On 11 November 2010, intermittent phone conversations were transmitted and were recorded by a listener (at 14:00 UTC) for a period of approximately 30 minutes.

[24][25] The phone calls mentioned the "brigade operative officer on duty", the communication codes "Debut", "Nadezhda" (Russian for "hope", or could refer to a common female given name), "Sudak" (an alternate name for the Zander, and also a town in Crimea) and "Vulkan" (volcano).

The female voice says: On 17 July 2015, the station broadcast what appeared to be a RTTY signal in lieu of the buzzer.

)Other instances of deliberate hijackings to make contact are widely unreported; however, there was another incident a day prior to the above event on 3 May 2024, whereas an unknown pirate—possibly the aforementioned—attempted to subject the buzzer to interference, whereby they were met with immediate retaliation from the on-duty operator who began preventative measures against the signal incursion; The UVB-76 operator combined three individual transmitters, with one above, one below and the other centre 4625 kHz transmitting MS-5 burst, along with CIS-12 modern audio as well as tones in several states, summarising together a highly dense spectral pattern with the upper-side band.

Numerous noticeable transitions were witnessed over the 4625 kHz selected spectrogram section, as the operators frantically fought against the pirates.

The incident occurred for around half an hour, until the operators ceased their tactics after the pirate abandoned attempts, as the buzzer was then reactivated.

However, Rimantas Pleikys, a former Minister of Communications and Informatics of the Republic of Lithuania, has written that the purpose of the voice messages is to confirm that operators at receiving stations are alert.

In addition, the static frequency of 4,625 kHz and the low transmitter power are likely unsuitable for reliable long-range communication.

Like the Buzzer, these stations transmit a signature sound that is repeated constantly, but is occasionally interrupted to relay coded voice messages.

[1] The former transmitter was located near Povarovo, Russia,[1][40] at 56°5′0″N 37°6′37″E / 56.08333°N 37.11028°E / 56.08333; 37.11028 which is about halfway between Zelenograd and Solnechnogorsk and 10 kilometres (6.2 mi) northwest of Moscow, near the village of Lozhki.

[41] In September 2010, the station's transmitter was moved to the nearby city of Saint Petersburg, near the village of Kerro Massiv.