... the book, they can not only hear the sound, but also can watch the movie by the pen ... children can record their own voice to compare with the builtin standerd sound, it is very useful for children to ... 2.4" TFT color screen, QVGA;3. Speaker, dual-channel, high-fidelity;4. Builtin memory, 4G Bytes Nand-Flash ... Memory;5. TF-Card, Can Expand Memory form 2GB to 8GB;6. USB ...