D820 is a revolutionary product that breaks the conservative and boring user experience of traditional ECR. It is an “integrated” sales system for complex business money collection environment. Using the rapidly developing tablet and mobile APP as the basis and taking the advantages of mature safety and the most advanced POS system, D820 becomes the first integrated design in the industry. It supports different sizes of Pad of third-party company, and supports auto-cutting printer, customer display interface, cash box interface, bar code scanner, PIN input keyboard and other related modules with combination of the point to point demand of all ordinary retail external equipment. It also supports other external payment devices, including Apple Payment.