Nest® Protect 2nd Generation, White (Choose Power Type) is the first home smoke and CO alarm system that can be quieted from your smartphone. The Nest smoke and carbon monoxide detector is designed to search for both fast and slow burning fires. What is particularly useful in the Nest Protect 2nd Generation, White is that it can tell you where the danger is. Protect your nest with the Nest Protect smoke and carbon monoxide alarm. How Does the Nest Protect Smoke Detector Work? The smoke alarm goes off when it is triggered by a traditional photoelectric detector method as well as an additional blue LED method. The system is called a “Split Spectrum Sensor” because it uses an infrared light above 700 nm to detect large smoke particles and also uses the blue LED to detect small smoke particles. How Does the Nest Carbon Monoxide Detector Function? The carbon monoxide aspect of the Nest Protect 2nd Generation, White detects the parts-per-million level of carbon monoxide and the alarm is triggered when the level is not within a safe range. An additional feature is that the Nest smoke and carbon monoxide alarm records and shows data on your smartphone so you can understand where fluctuations in carbon monoxide levels are coming from. What Are Some Improvements Seen in the Nest Protect 2nd Generation Compared to the Nest Protect 1.0? A great feature of the 1st generation that is still available in the 2nd generation Nest Protect smoke and carbon monoxide detector is that it uses WiFi and Bluetooth to send its alarm and also has a voice announcement to say exactly where the problem is originating. In addition, the alarm system gives remote notifications in addition to provided data about the carbon monoxide levels in your home. In terms of safety, the Nest Protect 2nd generation actually can function locally even if your Internet router is what starts the fire. The Nest smoke and carbon monoxide detector is operated by batteries so you do not have to worry about hiring an electrician to put in the necessary wiring for the unit to function.