How long is the warranty period of core synthetic technology products?

From the date of purchase of core synthetic products, you can enjoy 1-year after-sales service of quality assurance, but you need to follow the following principles: 1. Be able to show our valid warranty card. 2. The product is not disassembled, repaired or refitted by itself, and the QC mark is intact. 3. When the product is used in normal state, there are quality problems.