Sony WF-1000XM4 Manual page 77

Note
Depending on the ambient condition and the type/volume of audio playback, the ambient sound may not be heard even when
using the Ambient Sound Mode. Do not use the headset in places where it would be dangerous if you are unable to hear ambient
sounds such as on a road with car and bicycle traffic.
Depending on the surrounding environment, wind noise may increase when the Ambient Sound Mode is turned on. In that case,
change the settings from Normal mode to Voice mode using the "Sony | Headphones Connect" app. If the wind noise is still
significant, turn off the Ambient Sound Mode.
If the headset is not worn properly, the Ambient Sound Mode may not work correctly. Twist the headset to put it into your ears
properly.
Do not cover the microphones on the left and right units of the headset with your hands. If they are covered, the effect of noise
canceling function or Ambient Sound Mode may not perform properly, or a beeping sound (feedback) may occur. If any of this is
the case, remove your hands, etc. from the left and right microphones.
This headset is equipped with the function to detect a beeping sound (feedback) and cancel the sound in a short time.
In rare cases, the noise canceling function or the Ambient Sound Mode may temporarily stop in reaction to a high note such as
an alarm or an electronic sound, but the noise canceling function or the Ambient Sound Mode will automatically return in about a
second.
If the Ambient Sound Mode is enabled in a rather noisy environment, a noise may be heard. This is not a malfunction. In this
case, set the noise canceling function to ON or set the noise canceling function and the Ambient Sound Mode to OFF.
Related Topic
About the voice guidance
Wearing the headset
Using the noise canceling function
What you can do with the "Sony | Headphones Connect" app
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