Features :Conductive-ink technology, 4 spiral-bound books with coated paper pages Module: Light up pen ,with volume control and 2 LEDS Quiz it Pen Congratulates and encourages You! Playing together is Learning together especially with this set. This Eric Carle set includes 4 books with 64 pages of curriculum per book and the Answer Pen. The Quiz it Pen lights up and plays engaging sounds and phrases. With over 350 questions and answers this prepares young learners to meet today's educational standards. This set also includes a parents guide and 2 replaceable AAA batteries. The talking Pen will let your child know if they have chosen the correct answer no parental guidance needed.