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This is Nest's second-generation Protect smoke and carbon monoxide (CO) detector.

Published:Caption:Photo:Tyler Lizenby/CNET
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Both the wired and battery-powered units cost $99 in the US and £89 in the UK.

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Hardware for installation is included in the packaging and outlined in the included instructions.

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This new Protect has a slimmer, more rounded profile.

Published:Caption:Photo:Tyler Lizenby/CNET
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It also boasts an updated app.

Published:Caption:Photo:Tyler Lizenby/CNET
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The app allows for integrations with Nest's other products, the Nest Cam, the Nest Learning Thermostat and select Dropcam cameras.

Published:Caption:Photo:Tyler Lizenby/CNET
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The app gives you an at-a-glance look at the status of your home.

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You can receive alerts about potential issues and even silence an alarm remotely from the app.

Published:Caption:Photo:Tyler Lizenby/CNET
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The unit itself also displays various colors that change depending on the device's current status.

Published:Caption:Photo:Tyler Lizenby/CNET
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The LED ring will glow blue during setup or tests; green when everything's fine; white as an optional nightlight that illuminates when you walk underneath it; yellow/orange warns that there's a potential smoke or CO emergency and red for a real smoke or CO emergency.

Published:Caption:Photo:Tyler Lizenby/CNET
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