"The letter Sound Book has been incredible for both my son who is 4 and my daughter who is 2. They adore all the characters and pressing the buttons on the book. The cards that come with it allow the kids to create a game with the sounds and love competing on who can say the sound first. We have only had the book for a short time and my kids almost know all the initial sounds of the alphabet. Soon we will transition the characters into the letters with the cards."