Educational Insights Hot Dots Tots All Kinds of Babies Interactive Board Book Set with Elliott Pen Simply press Elliott to the correct answer dot on any page to activate fun lights and sound effects. Includes two interactive board books, Busy Babies and Good Night, Animal Babies, and Elliott-The Musical, Teaching Bear pen. Introduces shapes, colors, numbers, emotions, opposites, animal words, action words, and house words. Elliot-The Musical, Teaching Bear pen is not compatible with other Hot Dots or Hot Dots Jr. sets. Pen requires 2 AAA batteries (not included).