Get alerts on your phone.Nest Protect sends a message when theres a problem or the batteries run low.Every second counts.The Split­-Spectrum Sensor looks for both fast and slow-burning fires.Hush from the Nest app.Just burned the popcorn? Silence the false alarm with your phone. not your dish towel.Tells you what and where.Nest Protect speaks up if theres smoke or carbon monoxide and tells you where it is. so you know what to do.Easy installation.Nest Protect takes only minutes to install and you can set it up from your phone.BatterySix long-life AA Energizer® Ultimate Lithium batteriesWired120V ConnectorThree long-life AA Energizer® Ultimate Lithium backup batteries- Nest Protect (Battery)- Six long-life batteries (Energizer® Ultimate Lithium "L91" AA)- Backplate- Four screws- User's Guide- Welcome Guide- 2-year limited hardware warranty