The Nest Protect smoke detectors can detect smoke and carbon monoxide in your home. The Google Nest fire alarms are smart fire alarms. They give a signal in several ways in case of fire or smoke development. A voice first briefly tells you what's going on. Then, the alarm goes off. Via the Nest app, you'll be informed of the situation at home. This way, you also know what is going on when you're not at home. Do you have multiple smart devices? Pair them with the Google Nest Protect smoke detector. For example, have your lighting illuminate a path through your house.