Sony WI-SP510 Help Manual page 83

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.
Note
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.
If the headset's microphone rubs against your clothing, etc., noise may interfere with your voice input. When inputting a voice
command, change the direction of the remote control component so that the microphone's audio capture hole does not touch
your clothing, etc.
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.
Be careful because the headset will turn off when you press and hold the
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(play/call) button.