... it, when the pen touch the position of the page, the optical head can identify the code, so it ... pen, we can download more than one file of the book to the pen, so one pen can read more books.3 ... example, we can use Chinese , English and Japanese in one book, It is useful for children to learn languages. ... etc.7, Many books to selectWe have design more than 100 sound books in Chinese and English, If you ...