**Product Specifications:**
**Brand:** Leidi
**Product Name:** Encyclopedia Knowledge Energy Card
**Printing:** Double-sided color printing
**Dimensions:** 4*8cm (cards), 12.6*9.6*4.7cm (iron box)
**Quantity:** 168 cards/box, 4 boxes in total (672 cards)
**Non-repetitive knowledge cards**
**Classification:**
- Volume 1: Literature and History
- Volume 2: Mathematical Encyclopedia
- Volume 3: Astronomy and Geography
- Volume 4: Life Safety
**Material:** High-quality card paper
**Compliance:** GB6675.1-2014
**Rich content with no repeated knowledge points**
**Flip cover design with various types of encyclopedia knowledge**
**Includes topics such as literature, history, mathematics, science, astronomy, geography, life skills, and safety**
**Encourages good storage habits with a storage box for easy organization**
**Interactive gameplay with questions and answers, QR code scanning for audio explanations**
**Each card features a question on the front and an answer on the back**
**Promotes learning while playing and understanding the stories behind the knowledge points**
