Rounded corners, 360° all-round fine polishing, exquisite and rounded without water chestnut, it is the intimate guard of the baby. (The product does not include batteries) The crawling mat is washable, soft and comfortable, and is a mat for babies to lie on naked. Three-dimensional cute and interesting shapes of wonderful notes, keys, songs, music, color identification, easy learning while babies are playing, and the mode buttons can be switched at will. The integration of learning and fitness exercise makes babies grow faster. Every time you press and pedal the keys, it will produce a crisp and pleasant piano sound. In the piano mode, it will match the rhythmic music according to the baby's foot/slap rules, and cultivate the baby's musical sense from childhood. Detachable cute animal rattles: shake each rattle gently to make a rustling ringtone. The detachable design makes it more convenient to carry and store. Ability training: emotion, vision, intellectual development, crawling, hands and brains, grasping, senses, hand-eye coordination, other ability training, interaction.