Hot Dots - EII2390 Two-book set features 100 lessons on a variety of beginning reading skills from letter-recognition to reading readiness activities. Included Hot Dots pen offers a playful, interactive learning experience to encourage independent learning. Plus, it provides confidence-building feedback by responding with congratulatory phrases for correct answers and gentle redirection for incorrect answers. Pre-kindergarten level lessons include letter recognition, reading readiness, phonics, sight words, punctuation and grammar, and challenge reading lessons for advanced learners. Electronic pen requires two AAA batteries (sold separately).