This product is our choice for a smart smoke detector.
The Nest Protect V2 Battery keeps you informed about smoke development or carbon monoxide leaks in your home, anywhere and any time. As soon as this smoke and carbon monoxide detector is mounted to your ceiling, you can control it using the Nest app on your smartphone, tablet or smartwatch. If the detector detects smoke or carbon monoxide, it will tell you using a 70-decibel, female voice. This voice will tell you exactly where in the house the danger is. The app also keeps you up to date of low battery status or sensor outages. Use WiFi to connect the Nest Protect V2 to other Nest products, like the Nest thermostat and the Nest IP camera. This means you get extra benefits from the separate products. A green light will go on as soon as the motion sensor detects movement in the dark. The Nest Protect V2 (battery) runs on 6 AA batteries, which are included by default.