Smart one-button anti-whistle buttonUsing multi-point frequency shifting technology, it can effectively suppress howling, and at the same time prevent the sound from collapsing, so that your singing is vivid and vivid. | widely usedSuitable for many occasions, such as: weddings, large and small concerts, bars, KTV, family parties, etc. | Support U disk MP3 playbackEquipped with U disk interface, plug and play, easy to operate. |