Sony ULT WEAR Quick Start Manual page 18

When you wear the headset over a cap, cloth, a scarf, hair, etc., wearing detection may not work properly, and the touch sensor
control panel may not be available for operation. Wear the headset so that your ears are inside the earpads.
When the supplied headphone cable is connected to the headset, wearing detection does not work.
The wearing detection automatic music playback pause and resume function is only available when connected via Bluetooth
connection.
The connected device or playback application you are using may not support the wearing detection automatic music playback
pause and resume function.
When attaching and removing the headset, the call is switched only when the wearing detection automatic power off function is
enabled.
Related Topic
What you can do with the "Sony | Headphones Connect" app
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