1. This music box is sound controlled by precision IC-CPU with special melody. 2. There are 4 graceful lullabies, every song will play 7 minutes, the volume will turn down and slowly during playing and stop automatically at final. 3 When the sensor receive any noise (over 75db, for example: baby's crying) it will play music and flashing automatically. 4. Repeat this process circularly. The music will attract the baby's attention and mark it peaceful. 5. The melodious music help the baby falls asleep. This music box will be flashed by melody.