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1. Alibaba is a wholesale marketplace, and all products are not available for retail purchase. Retail customers are advised not to place orders. By default, neutral products are shipped, and to meet the requirements of most customers, the packaging does not include brand logos, manufacturer addresses, or production company information.For branded products and customized products, please contact online customer service. 2. Quality assurance: The product supports 7-day returns and exchanges for quality issues, 15-day replacement and 365-day warranty. For returns or exchanges not due to product quality issues, the buyer is responsible for all round-trip shipping costs. 3. For the convenience of customer cost accounting, all prices in our store do not include tax. If you need an invoice, please contact customer service to pay the additional tax. We can issue a VAT invoice; please confirm the tax rate with customer service!!! The invoice will be sent after confirming receipt of goods. Provides SDK for platform integration or Bluetooth protocol integration with a gateway, along with a mature backend system 1. Provide terminal SDK communication protocol for integration with the client platform 2. Open API interface for integration with customer platforms, as well as gateway interface 3. Custom development based on existing technical foundation, supporting various customizations, mold creation, design plans, and open-source code. For customization inquiries, please contact customer service This product is a neutral product made to order for customers and is not available for retail. To meet the requirements of most customers, the packaging does not include brand logos, manufacturer addresses, or production company information.If you need to add our company's address or brand information to the packaging, please contact customer service. 2. Our company has the capability for independent research and development. In order to enhance customer experience, we will continuously upgrade and improve product functions and appearance without prior notice.If there is a discrepancy between the description and the functional appearance, Please refer to the product. 3. We are the direct manufacturer and a reliable business partner. If you choose to cooperate with us long-term, we will consider your interests. As long as the items are not expired and not damaged by human error, we can provide.. High-quality after-sales service.Additionally, if there is a quality issue with the product from the date of purchase, we offer a one-month replacement for quality issues and a one-year warranty. The return shipping cost is borne by each party once. 4. All prices listed in our store do not include tax. If you need an invoice, please contact customer service!!! 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