Dynamic guitar with multi function key, toggle button/ switch to music & colorful flashing button. It cultivate the baby's cognitive ability to different colors and shapes. Key of different colors produce different kinds of music, which help practice the baby's memorizing ability. The baby will sing the song excitingly when hearing different kinds of music. Cultivate the baby's cognitive ability to various kinds of music. The concave and convex shape and texture can stimulate the baby's touch development.