You can watch live video from your Nest cameras and doorbells in the Google Home app. You can either zoom in on a single camera for a detailed picture or monitor multiple cameras through the Favorites tab in the Home app.
Watch live video from a specific camera or doorbell
Important:
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    Live video is available only for Nest cameras and doorbells that you control with the Google Home app. 
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    To help you quickly identify your camera, each camera tile will show a preview from your last live view session. 
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    The spinner and timestamp indicate a camera tile preview, while a green 'live' dot signifies live view. 
To conserve power, your live video stream will automatically stop:
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    Live video from battery-powered Nest cameras and doorbells stops after 5 minutes. 
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    Live video from wired Nest cameras and doorbells stops after 12 hours. 
To start the live stream again, click Watch live.
Learn how to check your cameras and doorbells on a computer with Google Home for web.
From Cameras
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    Open the Google Home app . 
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    Tap Cameras to view all your cameras and doorbells. 
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    If the camera isn't streaming, tap Turn on. 
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    If your camera is offline, tap Retry to reconnect. 
From Favorites tab
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    Open the Google Home app . 
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    Scroll to the camera you want to check. - 
        If the camera isn't streaming, tap Turn on. 
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        If your camera is offline, tap Retry to reconnect. 
 
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Turn your camera on or off in the Google Home app
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    Open the Google Home app . 
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    Tap the camera you want to adjust from Favorites or in the camera category space. 
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    Tap the menu icon at the bottom right of the screen. 
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    From there, you can turn the camera on or off. 
Add camera or doorbell to Favorites tab
When you add a camera or doorbell to the Favorites tab in the Home app, you’ll be able to view video on that tab.
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    On the Favorites tab in the Google Home app , scroll to the bottom of the page and tap Edit . 
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    Scroll to the "Devices" section and tap on the camera or doorbell that you want to favorite. You can select multiple devices at the same time. 
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    Tap Save. Your camera’s live view will now appear on the Favorites tab. 
Tip: If you add battery-powered cameras and doorbells to the Favorites tab, the frequent use of live feeds may impact their battery life.