Dual Microphones configured in a master/slave relationship. The MM205 Master microphone will accept connection from the MM206 Slave microphone. Dual Plug N Sing Handheld Karaoke Microphones with echo control. Connect the microphone to any DVD player and TV to create an instant karaoke machine. Songs included that allow the singer to turn vocals on and off with the remote control audio button. Turn vocals on so the singer can learn the song. Turn vocals off so the singer"s voice is mixed with the music. Great for parties and learning how to read!