Playskool Sesame Street Let's Rock! Cookie Monster Keyboard Packed with fun features, the Cookie Monster Keyboard includes three preschool tunes, three modes of play, and bright, light-up keys For even more rockin fun, the Lets Rock Cookie Monster Keyboard also interacts with the Lets Rock Elmo character (sold separately) who "magically" knows when you have the Lets Rock Cookie Monster Keyboard and plays along with you to the ABC Song Includes 3 "AA" batteries Keyboard comes with instructions