... of the child. We have prepared a lot of sound books, for example , Mathematic , English learning, Classic Fairy Tales , Chinese learning , game ... record icon, children can record their own voice to compare with the builtin standerd sound, it is very useful for children to ... -channel, high-fidelity;3. Builtin memory, 2/4G Bytes Nand-Flash Memory;4. TF-Card, Can Expand Memory form 2GB to ...