30 triggers feature sounds and voices Teaches simple words to young readers Embossed front cover 3 replaceable AG-13 button cell batteries included Sound button pictures appear in the printed text as their words occur in the story (sized so that story text and button text are equal for 'seamless' reading). When readers press a button, they hear the word read aloud. In most instances a corresponding sound effect also plays, to help make the pairing of object and word more memorable. Pressing a button for a second time in sequence plays the spoken word, the sound effect, and then the word is spelled.