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1. For the market, all products are not available, please do not place an order. The default shipment is neutral products, in order to meet the requirements of most customers, there is no brand, address, or manufacturer information on the packaging.Please contact online customer service for branded products and inquiries. 2. Quality assurance, product returns and exchanges within 7 days for quality issues, 15 days for replacement, and 365 days warranty. For returns and exchanges not due to product quality issues, the shipping costs are borne by the buyer. 3. Considering the convenience of customer cost accounting, all products in our store are priced without tax. If you need to issue an invoice, please contact customer service to collect the tax. VAT invoices can be issued. Please confirm with customer service that the invoice will be sent after confirming receipt of goods. Support SDK for connecting to platforms or Bluetooth protocol gateway with a mature backend 1. Develop terminal SDK communication protocol to connect with client platform 2. Open API interface to connect with customer platforms and gateway interface 3. Based on existing technology development, multiple options available, mold opening, drawing board, open-source code, please contact customer service if needed 1. This product is a Neutral product. It is made for customers. In order to meet the requirements of most customers, there is no brand, address, or manufacturer information on the packaging.If you need to print our company's address or brand information on the packaging, please contact customer service. 2. Our company has independent research and development capabilities. In order to enhance customer experience, we will continuously upgrade and improve product functions and appearance without prior notice.If there is any discrepancy between the description and the actual appearance of the product, Please refer to the product. 3. We are, and will continue to be, your choice if you choose to work with us long-term. We will consider your interests, and as long as the items are not expired or damaged by humans, we can offer assistance Excellent after-sales service.In addition, if there are quality issues with the product itself from the date of purchase, it comes with a one-month replacement guarantee for quality issues and a one-year warranty. Return shipping costs are paid once each time. 4. 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