Be sure to get the tag back.

Otherwise, next time they will use the imitation as the genuine product and buy it with this genuine label. There will only be one label for each payment.

Big brand sunglasses usually have their own anti-counterfeiting mark, or anti-counterfeiting code, and some also have anti-counterfeiting phone numbers, such as "SUPERSUNG" sunglasses. If they are genuine, each pair will have a unique anti-counterfeiting code like People's ID cards, the words and trademarks on the temples are also very clear and neat and are not easy to wear. Another important anti-counterfeiting sign is that as long as you breathe into the lens, the four swan trademarks will appear.