Twobook set features 100 lessons on a variety of beginning reading skills from letterrecognition to reading readiness activities 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 Prekindergarten 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