Sony WH-CH720N Help Manual page 95

Note
If the function when you press and hold the
app) is not available.
If the function when you press and hold the
is not available.
The Google app cannot be activated when you say "Ok Google" even when the Android smartphone's "Ok Google" setting is on.
When using the voice assist function, your voice will be heard from the headset through the headset's microphone (Sidetone
function). In this case, ambient sounds or the sounds of the headset operation may be heard through the headset, but this is not
a malfunction.
The Google app may not be activated depending on specifications of the smartphone or application version.
The Google app does not work when connected to a device not compatible with the voice assist function.
(play/call) button is set to [Google Assistant], the voice assist function (Google
(play/call) button is set to [Amazon Alexa], the voice assist function (Google app)
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