... The books with bilingual audio including:Foods, Life Products, The Natural, Basic Knowledge, Understanding Vehicle, Animal. 3. English and Chinese language4. ... prepared a lot of sound books, for example , Mathematic , English learning, Classic Fairy Tales , Chinese learning , game books,etc,. ... standerd sound, it is very useful for children to learn language.specification(P1,P3,P4,P6):1. OID Head, ...