... in 2GB SD card Comes with two wireless UHF digital microphones Full functions of karaoke: KEY CONTROL,TEMPO,ECHO,MIC VOL ... ,MUSIC VOL,VOCAL ON/OFF etc Supports 4 microphones (two wireless microphones and two wired microphones) and 4 people to sing at the ... song search Sort a songs from the included wireless digital microphones or additional remote controller and front panel directly. full functions ...