Phone Alerts: Nest Protect sends you a message when there’s a problem or the batteries run low 
Smoke and CO Locator: Nest Protect speaks up if there’s smoke or CO and tells you where it is, so you know what to do 
Detects CO: Carbon monoxide is an invisible, poisonous gas. Nest Protect tells you where it’s hiding 
A Light in the Dark: Usually Nest Protect has its light turned off, but when you walk underneath it, Pathlight can light your way 
Fast Detection: Every second counts. The Split Spectrum Sensor looks for both fast and slow burning fires