• From the Numberblocks, the 11-20 Activity Book & Interactive Pen is a learning toy that can be used to play with audio pens, and is loved by more than 100 countries around the world • Learn numbers from 11-20 with cute characters from the hit "Numberblocks" program on BBC operating in England. This educational toy will make learning fun and fun by touching and answering your activity book problems • If you find the answer to the problem, press the ● (Black Maru) near the illustration. If you get the correct answer, the top of the pen will glow green and the characters voice "Wow! or Marvelous! and other voices. If you are incorrect, the top of the pen will glow red and have a unique sound effect • From counting methods from 11 to 20 to multiplication and subsequent calculations, this is a complete activity book. Perfect for self-learning as it can help you know exactly what you answered right in just a push of a pen. It also helps you understand the concept of color with the character's colorful colors • Description: 2 x AAA batteries (batteries not included, so please prepare them separately); Japanese instruction manual included; Package size: Approx. W 9.1 x H 8.2 x D 2.0 inches (W 23.2 x H 20.7 x D 5.2 cm); Audio pen size: Approx. 1.1 x 6.5 inches (2.8 x 12.7 cm). Thickness 0.8 cm (not including the ring) / Recommended Age: 5 years and up