The first time you turn Sexaginta on, you can set time just roughly. But you don’t have to do even that—the clock is equipped with a radio transceiver tuned to the frequency of Radio Mayak.

Every hour Mayak transmits 6 signals imperceptible to the human ear. The sixth signifies the next hour. Midnight signals last for 100 ms each, and every next hour the sixth signal lasts longer—20 ms at 1 a.m., 40 ms at 2 a.m. and so on till 11 p.m. when the duration is 560 ms.

Sexaginta receives signals in the optimal band and automatically sets correct time.