Hello, you only need to copy the discount code, and paste the discount code in the discount use box when you checkout, and the system will automatically calculate the corresponding amount of the discount for you.
Our discount is only applicable to the products under the designated category, and you must purchase more than the corresponding amount of products before you can use it.
Sorry, if there is no quality problem with the product, we will not be able to refund you for free. If you desperately want a refund, you must bear the postage and then re-purchase.
Yes, as long as it is a product quality problem and is within our warranty period, you can contact our customer service by email and provide a picture or video certificate, and we will return and exchange the product for you normally.