Hot Dots - EII2391 Two-book set features 100 lessons on a variety of reading and language arts skills from reading comprehension and vocabulary to spelling and punctuation. 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. 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).