Power pen book set helps your students master beginning reading and math skills with activities that teach letter, sound, color, shape and number recognition. Hundreds of included activities give your children a jump-start on the skills they need to succeed. Its interactive design works with your Teacher Created Resources power pen (sold separately) to provide a fun, engaging learning experience for young learners. Spiral-binding allows each book to sit flat on desks or open completely to quickly select answers with your power pen. Books are designed for children attending preschool to first-grade.