Product Details  The product is affixed on a book. The content of the book is varies according to customer's requests.  1.Two AA7 battery,3V voltage,be able to change.2.This product is made from long time and big EMC memory sound IC,holding two hoursconversation time. 3.Easy operation,clear tone.Using with the childrens book,use it at anytime,replacing the disc. 4.On the product, there is 16 small pictures and they are 16 buttons in fact. 5.Press one button, it will tell one story. Press another button, it will tell another story. 6.The batteries can be changeable. 7.The children can learn words while listen to the sound,because the sound content is the same with the book content.  And they can choose any of the 16 story to listen. (music cartoon book/education book/ebook reader/e reader/electronic books)