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It might look like an ordinary battery, but Roost is anything but. Complete with Wi-Fi capability, Roost will send you a notification should your smoke alarm sound. Click through to see how this smart device can add retrofit connectivity to your old smoke detector.

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Caption:Photo:Tyler Lizenby/CNET
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Roost looks just like a 9V battery.

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And it installs into your old smoke detector.

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Put Roost into your smoke detector and install the app on your phone.

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The app will walk you through the rest of the steps to connect the battery to your router.

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And you're done. Roost's setup was as easy as any smart device I've ever tested.

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Roost's main app page and menus show all is well.

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You can easily add additional monitors to Roost, so your family can also receive notifications when an alarm sounds.

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The bottom of Roost pulls free, letting you peek at the packed-in tech.

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On the back of the battery, you can see a small microphone. Pull off the bottom to see Roost's circuits.

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You can also replace Roost's power source when it runs out, though Roost claims its battery can last up to five years.

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Once you're up and running, Roost stands guard for smoke.

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When an alarm sounds, your phone's notification will sound like a siren. Pull up the app, and you'll be prompted to take action. Roost's emergency contact defaults to 911.

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Published:Caption:Photo:Screenshots by Andrew Gebhart/CNET
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By swapping out the battery, you can make your old smoke detector smart. Thanks to the Roost Smart Battery, you'll be notified of any alert no matter where you are.

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