Lenovo um10c is a mobile karaoke device that integrates a sound card and a microphone. Basically, it can be used by connecting the mobile phone and plugging in the headphones without any adjustments. Its control panel has four buttons. One: Reverb, the effects from bottom to top are: original sound, concert hall, KTV (personally think the effect of a concert hall is enough), two: volume, the upwards are to increase the volume, three: dry and wet , the upper gear is dry, which means it sounds effective when you listen to it, but it is recorded as the original sound. The lower gear is wet, which means it sounds effective when you listen to it, and it is also effective when you record it. Four: Balance, from bottom to top, are Bass assist, original sound, treble assist, hope it can help you