... products withe e pen. Talking pen for the sound books "Preschool Sound Book " The reading pen is a popular ... attention of the child. We have prepared a lot of sound books, for example , Mathematic , English learning, Classic Fairy ... memory, 2/4G Bytes Nand-Flash Memory;4. TF-Card, Can Expand Memory form 2GB to 8GB;5. USB ... , High speed USB2.0;6. Earphone, 3.5 mm standerd eraphone slot;7. ...