Do I need to brush my face with a personal doorbell code?

Don't brush your face with a personal doorbell code. Personal doorbell code is for the convenience of "one old and one young" and other people who don't have smart phones or transportation to scan the code smoothly. Apply for a "personal doorbell code" on your mobile phone. After downloading, the pictures are sent to the residential property for printing, and the personal photos are plastic-sealed together for easy inspection.