Where to install your outdoor sensor
The outdoor sensor should be setup within 100-150 feet of your indoor sensor depending on line of sight. The outdoor sensor is designed to pick up noise near activity zones. Here is a good visualization of good outdoor sensor locations.
You should also avoid placing the outdoor sensor on any unstable structures like a tree limb or bush. If the sensors move often or vibrate this will affect their ability to measure noise. Avoid placing the sensors within direct line of sight of your pool pump or air conditioning unit.
The sensor should be within 10-20 feet of your largest activity zone, or any activity zone where you would like to monitor noise. The microphone hole should be pointed directly at your activity zone for the most accurate readings: