Whole Metal KTV Pre-stage Reverberation Effector New upgrade to the anti-howling digital mixer reverberator with LCD display screen design Can show the lyric . Built-in effect smart chip, sensitive knob and metal housing. There are modes of bass channel, center channel, left channel, and right channel, giving you a complete stereo feeling. Widely used in: weddings, concerts, bars, business meetings, business events, karaoke, family entertainment, outdoor performances and other occasions. Intelligent One-button Howling Prevention Using multi-point frequency shift technology to effectively suppress howling and avoid voice collapse, So that your singing is incisive and vivid. It is recommended to keep this function on.