A commodity can maintain its original quality and function, and if the commodity itself, accessories and trademarks are complete, it is regarded as intact. At the same time, it is also clear that consumers need to open the packaging of goods based on inspection, or make reasonable debugging to confirm the quality and function of goods, which will not affect the integrity of goods. Within the validity period of the Three Guarantees, if it meets the exchange conditions, and the seller requests to return the goods because there is no product of the same model and specification, and the consumer is unwilling to exchange other products of the same model and specification, the seller shall return the goods; If there are products of the same model and specification, and consumers are unwilling to exchange them and demand to return them, the seller shall return them and charge depreciation fees for old goods in accordance with these provisions. The depreciation expense shall be calculated from the date of invoice issuance to the date of return, in which the repair occupation and the time to be repaired shall be deducted.