While facial recognition automatically opens the door, if the sensor inside the door detects excessive outdoor PM2.5, it immediately triggers the fresh air system to 启动内循环 (initiate internal circulation). When a courier visits, the door's camera automatically captures images and pushes them to the mobile phone, whereas traditional anti-theft doors can only "stand by idly." The essence of this difference lies in the evolution of system doors from "hardware single products" to "smart home nodes" — the function of ordinary doors remains stuck in "anti-prying,"