The Roost Smart Smoke Alarm plays it safe

The Roost Smart Smoke Alarm uses the included Roost Smart Battery to connect to Wi-Fi. If something goes wrong in your home, the Roost will let you know, wherever you are.

The RSA-400, pictured here, senses smoke, fire, carbon monoxide and natural gas. It costs $80. The RSA-200 costs $60 and just senses smoke and fire.

You'll use the Roost app to connect to Wi-Fi. The app walks you through the setup with pictures.

The app is easy to use.

The Roost Smart Battery on its own costs $35.

The Wi-Fi-connected battery is what gives the Roost Alarm its smarts.

The Roost battery lasts five years, and will let you know via the app when it's short on life, so you'll never have to deal with those annoying chirps again. You can replace Roost's battery for $15.

Once you connect the battery to your Wi-Fi, your Roost Alarm is ready to go.

You can add monitors to your system so multiple people will get an alert should the alarm sound.

In our tests, the Roost responded quickly to smoke.

The app alerts you and gives you several ways to take action.

The Roost Alarm uses an ionized sensor with a microprocessor to help reduce false alarms.