What is the health code hanging around the old man's neck?

It's a paper health code, a two-in-one nucleic acid report code. Paper health code is an electronic health code neck card made for the elderly who don't have smart phones and other people in need. Equipped with a lanyard, it is easy to carry and can be reused, which avoids the anxiety that the elderly can't enter information when they are testing nucleic acid and going out to check the health code.