The Google Home speakers are pretty good recognising the “Ok Google” or “Hey Google” wake words, but sometimes prone to activating when similar words or phrases are spoken nearby. Any time the microphone is activated, your command (or conversation, if activated accidentally) is recorded and saved for future use. This shouldn’t be a problem for most people, but if you wish to reduce the chance of accidental activation, or indeed want to improve the range at which Google Home can hear you, you can now adjust the microphone sensitivity.
Adjusting “Hey Google” Sensitivity
Open the Home app on your connected Android/Google device, and tap the Google Home speaker you want to adjust the sensitivity on. You should now see the volume control for the speaker. If you don’t, it usually means that the speaker is currently not connected to the Wi-Fi network, and will need to be connected before you can continue.
Now tap the Settings icon at the top of the screen (the gear icon) to see the device settings. Scroll down to the “More” section and you will see “Hey Google” Sensitivity. Tap this to go into the setting.
On the sensitivity screen, you can use the slider to make the microphone less or more sensitive. Change the setting to achieve the sensitivity you want, and then give it a try by saying the wake word at different distances away from the speaker. You can always adjust the sensitivity again later if you find it still too easy or too hard to wake your Google Home speaker.