Thomas & Friends: Good Morning Engines has an attached six-button sound module that enables children to play six songs about Thomas from the popular television series. The song lyrics are printed on the book’s pages. The book is recommended for children ages 3 years and older. Book has coated board pages that stand up to extended use. The product conforms to the toy safety requirements of ASTM F963-08. Three replaceable long-life AG-13 button cell batteries that power the sound module are included.