Use the Power Pen to build skills and reinforce learning. The Power Pen is compatible with all Power Pen Learning Cards and Books. You simply select an answer and receive immediate feedback with an audio and visual response. The Power Pen sends positive responses to correct answers and encouraging redirection for wrong answers, keeping students motivated and on track. Engage students in active learning with Power Pen! Provide students with activities that help build foundational reading skills. The full-color cards provide picture clues to boost understanding. Power Pen sold separately. 53 double-sided practice cards Cards measure 5½" x 3½" Instructions and answer key cards Grades K+ Educational Insights Hot Dots Jr. Beginning Phonics 72 Flash Card Set. Pen works with both sets!!!!