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1.The shelf life of the products provided by Shanghai Yetuo Technology Co., Ltd. is 1Year, calculated from the date of acceptance by the purchaser. During the product warranty period, in case of failure due to our product quality problems, our company will provide free maintenance services according to the product quality problems. Maintenance method: repair hotline: 19961895916 (or contact the manufacturer's after-sales telephone). Judge the faulty parts through repair telephone communication, and the purchaser will send the faulty parts to the maintenance address provided by our company. The time from judging the fault to receiving the intact parts shall not exceed 1 working week, and all express expenses shall be borne by the sender.

2. If the warranty period is exceeded, both parties shall negotiate the maintenance cost amicably.