Nest Protect alerts your phone when something's wrong in case you're not home. It looks for both fast- and slow-burning fires. The Split-Spectrum Sensor uses two wave lengths of light to detect smoke. Nest Protect is the first alarm you can silence from your phone. Barely burned the popcorn? Get a friendly heads-up that you can silence using the Nest app. It tells you if there's smoke or carbon monoxide. When something's wrong Nest Protect speaks up to tell you what's wrong and where the danger is. Always be in the know. Looks after you for up to 10 years. Its long‐life sensors keep you safe and sound for up to a decade. It tests itself so you don't have to. Nest Protect checks itself over 400 times a day and lets you know if something's up. It reduces false alarms by looking for steam.