... . 32 pages per book Preschool Read Book This set of audio books including: National Studies, English, Pinyin, Cognitive, Literacy, Math, ... Stories, Songs. It will serve as standard audio books and become the basic audio products withe e pen. Talking pen for " ... Mathematic , English learning, Classic Fairy Tales , Chinese learning , game books,etc,. If customers need, we can help them to translate ...