Shanghai Yingkong Technology Co., Ltd. is a subsidiary established by Guangzhou Jukong in Shanghai. For customers of the Shanghai branch, we provide four guarantees: 1 Price guarantee: The product prices of the Shanghai branch are strictly set by the headquarters. If it is found that our prices are higher than other sales channels, double the difference will be refunded. The Shanghai branch issues formal commercial value-added tax invoices to all customers, making prices more affordable and services more convenient. 2. Product quality assurance: The product has industrial high-level high and low temperature testing and electromagnetic interference certification. If the product functions are inconsistent with pre-sales consultation, a full and unconditional refund can be issued. At the same time, we have a large number of photos of customers using the Giant Control GRM module on site, totaling over 400 MB. Please feel free to contact us for more information. 3. Technical service guarantee: We provide detailed product video tutorials (recorded by the Shanghai branch), product program samples, and QQ remote guidance to our customers at the Shanghai branch, providing high-quality product technical consultation and after-sales technical services. 4. Product after-sales guarantee: Product after-sales maintenance is convenient and fast. If there are any problems with the product, they can be directly sent to us. Even if it is burned out due to human error during the warranty period, if it can be repaired, it will be free of charge. For products that have exceeded the warranty period, they will only be repaired at cost price. We adopt a filing system for all customers. To ensure the after-sales service and technical support of your products, please choose Shanghai Yingkong Technology Co., Ltd., the subsidiary of Jukong Shanghai.