Sony FE 100-400mm f/4.5-5.6 GM OSS Lens - Manual (Page 105)

Note
The voice assist function (Google app) and the Google Assistant feature cannot be assigned to the headset at the same time.
The voice assist function (Google app) and the Amazon Alexa feature cannot be assigned to the headset at the same time.
The Google app cannot be activated when you say “Ok Google” even when the Android smartphone’s “Ok Google” setting is on.
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.
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A: Microphones (left, right)
For details on the apps which work with the Google app, refer to the operating instructions of the Android
smartphone.
After activating the Google app, the voice command is canceled when a certain time has passed without requests.
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