In China, various types of QR code services and products have appeared a few years ago. So far, the Sogou mobile phone input method has been equipped with the QR code scanning function, but not a lot of scale and its own business model. . In 2012, it was promoted by WeChat of 200 million users, and related products that realized service functions through QR codes quickly entered people's attention. On September 24th, even Sina Weibo announced the official online QR code function, providing three services: open the personal information page to quickly and easily powder, open the specified web page, and directly open the microblog publishing box that has entered the specific content. This article refers to the address: http:// The current popularity of QR codes is also formed under special conditions, which can be regarded as unintentional. It was originally invented by Toyota Motor for use in car identification. It was popular at this stage, mainly due to several aspects: 1 The popularity of network and smartphone hardware; 2 Consumers are beginning to pay more and more attention to interaction and information dissemination; 3 Two-dimensional code production has no cost, no requirement for the carrier, easy to use; 4 code system open source, low participation costs. ECG Trunk Cable,ECG Wire,ECG Patient Cable,ECG Lead Wire Dong guan Sum Wai Electronic Co,. Ltd. , https://www.sw-cables.com