1.With bluetooth function,Support to Karaoke APP connection on cellphone to sing in sync with tone & lyric
2.As a bluetooth speaker,Play music by connecting to cellphone 
3.As a microphone to amplify your sound 
4.Built in high stereo internal magnetic speaker 4Ω 3W*2
5.Material:Aluminum+ABS plastic
6.Built in 2200MA li-polymer battery
7.With TF and USB slot,Support to play music from USB/TF
8.ACC to eliminate vocal only leaving background music
9.5 kinds of effective voice to change
10.Mic on/off function independentl