Educational Insights Hot Dots Jr. Ace-the Talking, Teaching Dog Pen Requires 2 AAA batteries (not included, Works Best with Polaroid AAA Batteries). Not compatible with Hot Dots Tots activity sets. AceThe Talking, Teaching Dog lights up learning, bringing Hot Dots Jr storybooks and card sets to life! Simply press Ace to an answer dot on any Hot Dots or Hot Dots Jr. card or storybook for an immediate response! Ace offers affirmative "ruffs" and encouraging words for correct responses and provides gentle redirection for incorrect responses. Ace also glows green for correct answers and red for incorrect responses! Ace provides all the feedback your child needs to work through hundreds of Hot Dots Jr. early learning activities. Supports independent, self-paced learning. Ace grows with your child through dozens of Hot Dots and Hot Dots Jr books, workbooks, and card sets covering reading, math, science, and more!