Twobook 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 confidencebuilding feedback by responding with congratulatory phrases for correct answers and gentle redirection for incorrect answers Kindergarten level lessons include letterrecognition, reading readiness, phonics, sight words, punctuation and grammar, and challenge reading lessons for advanced learners Electronic pen requires two AAA batteries sold separately