In the DOA case, we will generate a waybill code, you just need to ship out your product with the code and do not need to pay for the shipping fee. In the case of return or replacement without reason, you need to ship out the product(s) and pay by yourself. We do not pay for delivery upon arrival of your return, and packages where insufficient postage has been paid will be rejected or sent back to you. If the product(s) fail in the inspection, we will return the product(s) to you after you pay for the shipping fee.