Is it legal for Xiaomi's door lock to have a camera?

Xiaomi's door lock with camera is legal, does not involve invasion of privacy, and is not illegal. It is definitely good to lock the camera intelligently, so you can see who opened the door from the inside and play a certain monitoring role. At present, there are three kinds of situations with cameras: (1) smart lock with cat-eye doorbell, which can realize remote video call, stay outside the door to capture photos, check the number of times the door is opened through the mobile app, and warn the elderly and children when they go home. 1080p HD video No matter how far you are at the door, the situation is clear at a glance, and there are people guarding the door to take real-time snapshots and send them to the owner's mobile phone for remote video calls. The cat's eye will automatically record video. (2)3D face recognition. The main function of the camera is to open the door and truly unlock it without contact. This camera doesn't have the first function, such as capturing and recording. (3) That is to say, the combination of the first two can capture pictures, and the video can also brush the face to open the door. There are fewer smart locks with this function.