On the hour, the dial opens into sections. Plays one of 30 melodies every hour on the hour from 3 different melody selections. Auto night shut-off Demonstration button Volume control. On the hour the dial splits in two to reveal crystal elements and four rotating majorettes playing a choice of 24 classical and 6 Christmas carols. Also with night time shut off and volume control, requries 2x D batteries (included). Measures 47 x 39 x 10cm.