The radio bird was a mechanical, bellows-operated system to fill in the downtime of cues during radio broadcasts, from the first year, 1924. It was so called because the sound, a sequence of four notes, was very similar to the chirping of a small bird. His real name was "interval signal." The sound is still used in regular radio broadcasting when national broadcasts give way to regional ones, particularly before radio newspapers broadcast from the various Rai regional offices. Compared to the original form, the present bird includes only one chirp sequence instead of the original four.