Features: Developmental music by Bach, Mozart, and Beethoven for relaxing, cognitive development, or stimulating. 4 different types of movement and motion to keep baby fascinated. Soft & colorful animals/geometric shapes angled to baby's direct line of vision. Beads that slide from side to side with each turn of the arms. An electronic music box with easy push-buttons - no winding is required. Long playing music with a choice of three tunes of 15 minutes each of continuous music. Or, default option plays all 3 tunes (of 5 minutes each) consecutively for a total of 15 minutes of continuous music. Fits most cribs with easy attachment mechanism. A detachable music box for long term use. The Mobile's swivel arm can be moved from side to side for convenience. High/Low music volume adjustment. Uses three AA batteries (not included).