Redesigned Content by TeacherThis upgraded set contains 255 cards - 510 sides. 31 topics in total, such as letters, numbers, animals,colors, shapes, family members, transportation, behavior, months, and more. Easy to Use Just insert the card into the reader solt, the reader will read the words and make a simulated sound automatically. Emulated SoundWhen you insert an animal card, the reader can not only read the word, but also make sounds that imitate animals. Likewise, when you insert a vehicle card, it will also make simulated vehicle sounds after telling you what vehicle it is. Make Learning Fun Make learning a game, Children's song mode and animal-like sounds will keep the little ones interested. Tested by more than 100 children, they greatly reduced screen time, learning more than 60 minutes a day with this toy.