... : this pen is used to matched books , it can read and repeat books by pointing at word, sentence(s),notes ... player function, support MP3, it can be operated by volume key easily. Recording: it's available to OID ... can be upgraded to 8G, kid could take more books in pocket and learning at anytime ,anywhere; U- ... original voice, at last , the pen can read the books .)Is the pen expensive? what's the MOQ ? ...