Google Nest Protect Smoke & Carbon Monoxide Alarm/Detector - Wired / WhiteThe Google Nest Protect Smoke & Carbon Monoxide Alarm Detector. 1 Single detector, White color design. Wired version. Features: 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