Book Printers publishers Learning,story,sound book 40 pages per book,Nice ... Repeat3. Translation4. Volume control5. MP3 player6. Record7. Select songs8. Page-turning9. Li battery10. Listening with earphone or external deviceBook Special ... internet and easy play by the pen.3. Every page of the OID book has printed a record icon, ... Battery, 300 mah high capacity lithium battery. Book Printers Publishers