Hi Choi Minseok, Sorry to hear this issue. We will improve the quality control process. Most of the items sold on FastTech.com are covered by FastTech Standard Return Policy, i.e. replacement can be requested within 6 months from date of shipment and refund within 45 days from date of delivery. This item is covered by the said warranty. For more details, please visit this page: http://www.fasttech.com/pages/standard-return-policy. In this case, the details are as below: --------------------------------------------------------------------------------- "Unless otherwise noted on the product page, product warranty is 6 months counted from the date of shipment. •Within 3 months from shipment: Upon returning, defective items are replaced and shipped back to customers for free. Return shipping reimbursement is USD 40 or 50% of the item's price, whichever is lower." ------------------------------------------------------------------------------------ The replacement will be sent when the return package delivers. And shipping reimburse is arranged when we receive the shipping slip. Please kindly confirm above and we will send you the RMA number and return instruction in next mail. Please don't return the defective items back before you receive the RMA number. Thank you for your understanding.

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