... with thousand songs but you didn't know how to sing or most of the songs are ... UHF digital microphones Full functions of karaoke: KEY CONTROL,TEMPO,ECHO,MIC VOL,MUSIC VOL,VOCAL ... of karaoke such as:vocal on/off, echo, key control, tempo, Melody volume control, favorite songs reserve ... customize background function Interchangeable background for user to add their favorite one Live colorful background and ...