Know more, worry less. The Nest Protect looks for fast burning fires, slow, smoldering fires and invisible carbon monoxide. It speaks up to tell you what the problem is and where it is. It can also give you a friendly Heads-Up before it has to sound the alarm and you can hush it with your phone. In case you’re not home, Nest Protect alerts your phone when the alarm goes off or the batteries run low. Click to shop Nest Protect at The Home Depot.