... Preschool Sound Book This set of audio books including: National Studies, English, Pinyin, Cognitive, Literacy, Math, Stories, Songs. It will serve as standard audio ... can record their own voice to compare with the builtin standerd sound, it is very useful for children to learn language.specification(P1 ... Memory;4. TF-Card, Can Expand Memory form 2GB to 8GB;5. USB, High speed USB2.0;6. Earphone, 3.5 mm ...