numbers, So that you can look up song either by the singer’s name or title of the song. After you choose a song to sing, enter the code numbers of the song into the remote control by pushing the buttons on it to send information to the karaoke set. Soon your music will start. The remote control also has a section to change the key or tempo of the songs. If you feel the key of the song is too high or low for you, or too fast or slow, you can adjust them as you want. Also, if you want to have harmony