Facial recognition is a technology based on the continuous evolution of algorithms and massive data. 

Currently, our Facial recognition can complete the following tasks:

1. In the case of sufficient lighting, when someone rings the doorbell, the accuracy of facail recognition would be 90%.

2. In the case of sufficient lighting, when someone stands in front of the doorbell, the accuracy of facial recognition is 90%.

3. In the case of nighttime or insufficient lighting, when someone rings the doorbell, the accuracy of facial recognition is 70%.

4. In the case of nighttime or insufficient lighting, when someone stands in front of the doorbell, the accuracy of facial recognition is 70%.