Xiaomi has launched a crowdfunding campaign in China for a smart front door. The Xiaobai Blade Star has 3D facial recognition technology, plus six alternative ways to unlock the door, including a fingerprint scanner and an NFC reader. Like some smart locks, the door comes with a camera to show you who is calling.
https://www.notebookcheck.net/Xiaomi-unveils-the-Xiaobai-Blade-Star-smart-front-door-with-3D-facial-recognition.613830.0.html