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Ordering Instructions All products in the store are shipped without invoices by default. If you need an invoice, a tax surcharge will be applied. Please consult customer service for the tax rate.The product is in foreign language by default, please contact customer service in Chinese Within seven days of product receipt, if there is a quality issue not caused by human damage, the product can be exchanged for a new one of the same model without affecting its resale value, with each party paying their own shipping costs.6-month warranty, please contact customer service for information on repair times and the cost of replacement parts This store operates on a wholesale basis, and all transactions are considered commercial trade partnerships, not ordinary consumer purchases. We do not support returns without a valid product quality issue, such as the buyer not liking the item, finding it unsightly, not being able to sell it, or not being accustomed to using it. We do not offer retail sales to individual customers, nor do we provide after-sales service for retail customers or those who wish to purchase samples. Customers who wish to use our drop-shipping service should contact customer service for more information.Please consider carefully before purchasing, thank you for your understanding We will ship customized products according to the agreed-upon date. For non-customized products, we normally ship within 72 hours after the order is placed. Due to high daily shipping volume, we cannot guarantee that any product will be in sufficient stock. You may contact customer service before placing an order All product data is for reference only and cannot be used as professional equipment, such as medical equipment, and is intended for buyer reference only.If parameters are changed or updated later, the company will no longer make modifications, and discrepancies in parameters cannot be used as grounds for returns or exchanges