When your Google Nest or Google Home speaker or display hears (“OK Google” or “Hey Google”), it records what you say and sends the recording to Google to fulfill your request.
To hear a brief sound at the start and/or end of your request:
Make sure your mobile device or tablet is connected to the same Wi-Fi as your speaker or display.
Open the Google Home app Google Home app.
Select your device and then Settings .
Scroll down to “Device settings,” then select Accessibility.
If you want to hear a sound only after your say “OK Google,” turn on the toggleOn next to Play start sound and leave the Play end sound slider off Off.
If you want your device to play a sound after you say “OK Google” and after Assistant stops listening, turn on the toggles On next to Play start sound and Play end sound On.
Thats it, as easy as 1,2,3.