The Nest Protect smoke carbon monoxide CO alarm does much more than just sound a shrill alarm when theres danger in your home. It speaks to you telling you where the danger is and what the problem is. Or if theres only a little smoke from just burning the toast it gives you a friendly Heads-Up. It also gives you peace of mind by testing itself constantly and showing you everythings working with a quick green glow when you turn off the lights. It integrates with your mobile devices and even messages you if the batteries run low avoiding that all-too-familiar midnight low-battery chirp.Features. Know from anywhere - Connect Nest Protect to Wi-Fi and it will send a message 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 there&#39s smoke or CO and tells you where the problem is so you know what to do. Nest Protect sees the CO you can&#39t - Carbon monoxide is odorless invisible and deadly. When there&#39s CO Nest Protect tells you where it&#39s hiding. Nightly Promise - Nest Protect tests its sensors and batteries constantly and lets you know they&#39re working with a quick green glow at night. Silence the chirp - Low-battery chirps ever rattle your dreams Nest Protect shows you its batteries are good. Before you doze off. Alarm Battery. Color - White

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