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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.

Caption by / Photo by Tyler Lizenby/CNET

Roost looks just like a 9V battery.

Caption by / Photo by Tyler Lizenby/CNET

And it installs into your old smoke detector.

Caption by / Photo by Tyler Lizenby/CNET

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

Caption by / Photo by Tyler Lizenby/CNET

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

Caption by / Photo by Screenshots by Andrew Gebhart/CNET

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

Caption by / Photo by Tyler Lizenby/CNET

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

Caption by / Photo by Screenshots by Andrew Gebhart/CNET

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

Caption by / Photo by Screenshots by Ry Crist/CNET

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

Caption by / Photo by Tyler Lizenby/CNET

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

Caption by / Photo by Tyler Lizenby/CNET

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

Caption by / Photo by Tyler Lizenby/CNET

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

Caption by / Photo by Tyler Lizenby/CNET

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.

Caption by / Photo by Screenshots by Andrew Gebhart/CNET

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.

Caption by / Photo by Tyler Lizenby/CNET
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