A dynamic and fun storybook comes with a voice changer device that transforms your voice to sound like the awesome Transformers character, Optimus Prime. Based on the exciting new Transformers movie, Revenge of the Fallen, this book and electronic voice changer puts readers—and their voices—into the middle of the action. The voice changer microphone can be used to amplify and alter voices to sound like the heroic Autobot, Optimus Prime, as well as make two cool sound effects. Special icons appear throughout the story encouraging young readers to use their voice, making this a totally new and cool way to be a part of all the Transformers action.