Mr. Christmas Digital Musical Lights and Sounds The famous Lights and Sounds of Christmas is now compatible with digital audio (MP3) players--making it a Digital Musical Lights and Sounds. This new digital Lights and Sounds of Christmas allows you to synchronize your lights in rhythm to your own favorite music. It also comes preloaded with 20 holiday favorites. Simply connect your digital audio (MP3) player, plug in your lighted decorations and watch as the lights flash to the beat of the music. Fully adjustable volume control. UL Listed for Indoor Use.