This is a smart home applications，the device connected to the application is installed in the door,when a visitor comes,it can tell you and store visitors records.When the guests rang the doorbell，you can see them throuth it.
This is a smart home applications，the device connected to the application is installed in the door,when a visitor comes,it can tell you and store visitors records.When the guests rang the doorbell，you can see them throuth it.