Know more, worry less. The simple act of beeping has saved thousands of lives. But a beep only lets you know that there's a problem. Somewhere. In an emergency, you don't have time to guess what's wrong. With Nest Protect, you don't have to. Meet the Nest Protect smoke and carbon monoxide alarm. Always know. From anywhere. Get a message on your phone or tablet if Nest Protect sounds the alarm for smoke or carbon monoxide. It will also send you a message if the batteries start to run low. And you can check the status of batteries and sensors. A clear voice when things go wrong. In addition to an alarm sound, Nest Protect speaks to you with a human voice. It tells you what the problem is and where it is so you know what to do. And if you have more than one Nest Protect, they can speak up at the same time even if Wi-Fi is down. Makes you a promise. When you turn off the lights to go to bed, you'll see your Nest Protect glow green for a second. That means batteries and sensors are working. It also means you won't be waking up at 2am to low-battery chirps. Sweet dreams. Sees what's invisible. You can't see carbon monoxide. Or smell it. Its early symptoms are easily mistaken for the flu, but longer exposure can be deadly. That's why Nest Protect constantly looks for dangerous levels of carbon monoxide. Easy installation. Both Nest Protect (Wired 120V) or Nest Protect (Battery) take only minutes to install. Connecting to Wi-Fi and setting them up with your iPhone, iPad or Android device also takes just a few minutes. Every Nest Protect in your home will connect to the others automatically.