The Love to Play Soft Books with Sound are interactive and make reading extra fun. When the attached wand touches metal snaps throughout the book, a sound plays. Plays 8 classical music pieces and makes different instrument sounds when wand is placed over specific metal snaps in book. This book is great for young children to explore their curiosity and develop their minds. It is also a medium for parents to bond with their young children over a fun activity. If you are looking for a book which provides educational content for your child while at the same time keeping them entertained and occupied, this is the ideal book. Made of polyester and velcro. Measures 8" x 8". Surface washable only. Requires 3 1.5v button cell batteries, included. Batteries are replaceable by opening the top section of the last page of the book.