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The Nest Guard hub pictured is the brains of the $499 Nest Secure alarm system.

The system is currently only available in the United States. At the current exchange rate, $499 converts to roughly £380 and AU$650.

Caption by / Photo by Tyler Lizenby/CNET

The Guard has an 85-decibel siren, a keypad for arming and disarming and an LED ring that alerts you to the system's status.

Caption by / Photo by Tyler Lizenby/CNET

Enter your 6-digit PIN code to arm and disarm your Nest Secure.

Caption by / Photo by Tyler Lizenby/CNET

You can also arm and disarm with a Nest Tag key fob.

Caption by / Photo by Tyler Lizenby/CNET

Just tap a Tag gently on the top of the Guard to arm or disarm.

Caption by / Photo by Tyler Lizenby/CNET

The system also comes with two Detect sensors. Use them as open/close sensors on doors or windows, or simply as motion sensors when attached to a wall.

Caption by / Photo by Tyler Lizenby/CNET

Nest's secure system integrates with Nest Cams.

Caption by / Photo by Tyler Lizenby/CNET

You can adjust settings and check on your system remotely from the Nest app for Android and iPhone.

Caption by / Photo by Tyler Lizenby/CNET

Nest is bringing optional professional monitoring (via Moni) and cellular backup (via T-Mobile) to the Secure system, but they aren't available yet.

Caption by / Photo by Tyler Lizenby/CNET
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