Make independent practice fun with the Power Pen! The Power Pen works with Power Pen cards and books to provide instant feedback on phonics, math or reading comprehension questions. Kids can hold the tip of the Power Pen to an answer circle and get a "Hooray!" or "Yahoo!" if they select the correct answer. If the pen is pressed to an incorrect answer, the pen provides encouragement to try again. Card sets or books with Power Pen-compatible questions are available for a variety of academic topics. Please note that one pen works with all of them, so the Power Pen is not included in the card or book sets.