Nest Protect Smoke and Carbon Monoxide Alarm, Battery Powered (Second Generation) Designed in USA IT'S TIME TO KNOW MORE AND WORRY LESS: The Nest Protect is not like other smoke alarms. You no longer have to spend time worrying about whether or not your smoke detector is still working, or what the blinking lights mean; Nest Protect can tell you everything you need to know! With automatic battery self-check, the Nest Protect helps take the hassle out of dealing with smoke alarms. EASY TO UNDERSTAND ALERTS: Unlike other smoke alarm systems, the Nest Protect doesn't beep when there's danger, the Nest Protect talks to you and alerts you to what's going on. Whether it's burnt toast in the kitchen or carbon monoxide in the living room, the Nest Protect uses clear spoken messages to alert you to the danger. The Nest Protect also works with most cellular devices, allowing you to receive notifications on your phone whenever something happens. TAKE THE HASSLE OUT OF SMOKE ALARMS: Tired of getting woken up at 2 a.m. by your smoke alarm? Long before it has to chirp, Nest Protect tells you its batteries are running low with a message on your phone. With routine self-checks as well as being able to remotely test all the devices in your home; Nest Protect takes the hassle out of dealing with your smoke alarms, and helps to put your mind at ease. WORKS WITH NEST: Nest has worked hard to design thoughtful devices to help keep you safe and secure. Nest devices not only communicate with each other but also with the other smart devices around your home. Your Nest Secure can use your smart light bulbs to help get your attention in the event of an emergency; your smart washer and dryer can take the data from Nest and run the next load of laundry when energy demand is low. Look for the Works with Nest badge and let Nest handle the rest. THERE'S NO PLACE LIKE A NEST HOME: We love home. Its the best place in the world. But not everything inside our homes is lovable. Some things beep at us; fail without warning; keep us in the dark. There are things weve learned to ignore. We think these things should do more. Nest is focused on making simple, human, delightful things. Thats how were creating the thoughtful home: A home that takes care of the people inside it and the world around it. Know from anywhere. Connect Nest Protect to Wi-Fi and it will send an alert to your phone if the alarm goes off or the batteries run low. Tells you what and where. It speaks up to tell you if theres smoke or CO and where the problem is, so you know what to do. App Silence. Nest Protect is the first alarm you can hush from your phone. Simply walk to the Nest Protect that noticed the problem and open the Nest app. Split-Spectrum Sensor. In an emergency, seconds count. Nest Protect uses two wavelengths of light to look for both fast and slow burning fires. Heads-Up. Get a friendly voice alert so you can handle burning toast before it becomes a burning toaster. 10-year carbon monoxide sensor. Carbon monoxide is odorless, invisible and deadly. When theres CO, Nest Protect tells you where its hiding.