1. Sound or voice accessories matching voice book, voice triggering by outside 16 Buttons; 2. Sound children book is of instructive function and enhances children's pronunciation ability; 3. Music or voice time duration is designed according to customer's demands and standards; 4. Theme and content on sound book is costomized in demand of client; 5. High- quality acoustic, long time duration, competitively in price; 6. Components: An interactive sound module Wipe-off pages (pages quantity required) Full-color illustrations (paper printing required) 16 sound keys (alterable) A built-in speaker (8Ohm) AG cell or A type battery A set of plastic shell ( size and specifications required) and more! Customized messages are quite welcomed!