Trolls Sing Along  MP3 Microphone with Built in Music and Connects to Any MP3 Player Real working microphone with built-in speaker Sing to your favorite Trolls music (built in), or plug in your MP3 player (not included) to sing along with your music Multi-colored lights flash with the music Works with any MP3 player (not included) via the line-in connection Cord stores neatly inside microphone when MP3 connection is not in use