Haha, first open the rice cooker in the lid and look at the light. There will really be a line of laser code on the cover. Second, there is a small piece of paper with a bar code on it. A small detail, you can look at the power cord, there are beautiful signs, the appearance of workmanship. The most important thing is that you can't disassemble these two codes yourself. If possible, there will be at least one bar code in the disassembled machine. See how many conditions you have.