With Google Nest Aware subscription, you can use Familiar Face detection to teach your Google Nest Cam (Battery) to recognize faces of people that you know, and notify you when it detects people it doesn’t recognize. Over time, facial recognition becomes more accurate at determining familiar faces and can send you more helpful alerts. You can also manage your familiar faces library to change a person’s name or remove familiar people from the library. To turn Familiar Face detection on or off: Open the Google Home App. Tap ‘Settings’ > ‘Nest Aware’ > ‘Familiar Face Detection’ to turn on or off. Here’s more information on Familiar Face detection .