As a security feature to warn potential porch pirates or would be intruders, the doorbell has a feature which outputs a very loud beep when the PIR alarm is activated. While some people may find this useful, others may find it annoying. Here is how you can turn it off:
Open up your EZviz App and go to the live view of your doorbell. From there, click on the gear icon to enter into the doorbells settings:
Click "Alarm Notification"