1. Alibaba operates as a wholesale marketplace, and all products are not intended for retail. Retail customers, please do not place orders. By default, products are shipped in neutral packaging. To accommodate the needs of most customers, the packaging will not include brand logos, manufacturer addresses, or any other identifying information about the production facility.For branded products and custom orders, please contact our online customer service. 2. Quality Assurance: We offer a 7-day return and exchange policy for product quality issues, a 15-day replacement guarantee, and a 365-day warranty. For returns or exchanges not related to product quality, the buyer is responsible for all round-trip shipping costs. 3. To simplify cost accounting for our customers, all prices listed in our store are exclusive of tax. If you require an invoice, please contact customer service to arrange for the tax to be added. We can issue VAT invoices; please confirm the applicable tax rate with customer service. Invoices will be sent after confirmation of receipt. We provide SDK for platform integration or Bluetooth protocol for gateway integration, along with a mature backend system 1. Provide terminal SDK communication protocol to integrate with customer platforms 2. Open API integration with customer platforms and gateway interfaces 3. Custom development based on existing technology, supporting various customization options, including mold making, design boards, and open-source code. Please contact customer service for customization inquiries 1. This product is a custom-made item, not intended for retail sale. To accommodate the needs of most customers, the packaging does not include any branding, manufacturer address, or production information.If you would like to have our company address or brand information printed on the packaging, please contact customer service. 2. Our company possesses strong in-house R&D capabilities. To enhance the customer experience, we will continuously upgrade and improve the product's features and appearance without prior notice.If there is a discrepancy between the description and the actual appearance or functionality, Please refer to the product for details. 3. We are the original manufacturer and a reputable business. If you choose to establish a long-term partnership with us, we will prioritize your interests. As long as the products are not expired and not damaged due to human error, we can provide them High-quality after-sales service.Additionally, if there are any quality issues with the product itself from the date of purchase, we offer a one-month replacement warranty for quality-related problems and a one-year warranty. Return shipping costs will be split, with each party covering one round of shipping. 4. All prices listed for our products do not include tax. 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