A set of 8 books, namely diary adventure, interesting language, perfect composition, scientific discovery, playing math, ancient aliens and wilderness detective, cost 229.8 yuan. My family bought a Pinyin version, so that children can read new words by themselves. This set of books is extracurricular reading. I'm satisfied with AR technology, and it's interesting to operate with my mobile phone. The overall content is not boring, and children are quite willing to watch it. My family is a male treasure, and I am most interested in science and aliens. Sometimes you can test us with what you have just learned and teach us behind our backs, haha.