If parents want to check their children's health code outside the province, they can send the health code of the screenshot to a mobile phone, which is also possible. Now all parts of the country are connected to the Internet.
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 promulgation of the Health Law aims to make the resumption of work more accurate, scientific and orderly.