... of Piano Sound Book 1. Application in education book, kids book, story book, learning book, piano book, English book.2. Function: ... , light sensor4. Panel material: ABS plastic5. Panel size: existed or customized6. Button available: 3-10 buttons7 ... Turkey, Poland, Switzerland and so on14. Book size: customized15. Book page: 3-10pages16. Book design: artwork availablePacking detailsNet weight: 100g ...