Because the font of "health code" is too small, the controller needs to be close to others and close to the mobile phone to identify it, which is neither safe nor efficient. In this regard, some people wrote social conditions and public opinion information, and put forward the suggestion that "the health code can display the time at the top and set it in a large font to facilitate rapid and remote identification", which was adopted by the health code special group.
Health codes are based on real data and can be generated by citizens or people who have returned to work through online declaration and background audit.
As an individual entering and leaving electronic certificate locally, the QR code can be declared once, which is universal in the whole city. The introduction of the health code aims to make the work of returning to work more accurate, scientific and orderly.