Please login to display your prices

Nest Protect WiFi Smoke & Carbon Monoxide (2nd Gen) - Wired


Your smoke alarm just got smarter

We've all had that moment of panic when the smoke alarm blasts us out of a deep sleep. Where's the smoke? Is it a crumb in the toaster oven, or is the kitchen engulfed in flames? Your standard alarm can't tell you much, but a Nest Protect can give you an instant report, so you know what to do next.

In fact, if you install multiple Nest smoke detectors, they can talk to each other so you know which room or rooms are affected. As soon as Nest Protect senses there's a problem, you'll get a friendly notification. If things get worse, Nest Protect will flash red, sound an alarm and tell you what you need to know, using words. It can also send a message to your phone or tablet so you know what's going on when you're away. The detector connects to a 120-volt AC line with three included wire nuts.

Part of your whole-home Nest system

Your Nest devices work together to give you more control over home security. If your smoke detector sends you an alert while you're at work, you can turn on your Nest camera and assess the situation instantly, then use the camera's microphone and speakers to warn anyone who might be home. Even better, if your Nest Protect senses rising levels of carbon monoxide, your Nest Thermostat can automatically turn off your gas furnace.


  • Sends a message to your phone if the alarm goes off or the batteries start to run low.
  • Can deliver an early warning in the form of a Heads-Up alert that tells you where smoke or carbon monoxide levels are rising.
  • Compatible with:
    • Amazon Echo (Alexa).
    • Google Home.
  • Connects to a 120-volt AC line with three wire nuts (included):
    • Three long-life AA lithium-ion batteries included for battery backup.
  • Nightly Promise lets you know all is working well with a quick flash of green glow when you turn out the lights.
  • Pathlight automatically lights your way when you get up in the middle of the night.
  • Free Nest app works with iOS and Android smart devices.
  • Two-step authentication makes your Nest devices more secure.
  • Hush false alarms from the Nest app.
  • Smartphone control requires connecting the Nest smoke detector to your Wi-Fi network.
  • Large external button lets you test the device with a single touch.
  • Compatible with additional, optional Nest home automation modules.
  • Voice alerts can be delivered in English, Spanish, French, or Dutch.
  • Mounts easily with four included screws.
  • Dimensions: 5-5/16""W x 5-5/16""H x 1-1/2""D
  • Weight: 13.9 oz.


External button and connector

Nest button

Size and weight

Height: 5.3 In (13.4 cm)
Width: 5.3 In (13.4 cm)
Depth: 1.5 In (3.85 cm)
Weight: 13.9 ounces (379 grams)


Split-Spectrum Sensor Electrochemical carbon monoxide sensor Heat sensor Humidity sensor Occupancy sensor Ambient light sensor Omni directional microphone, 70dBA SNR

Speaker, horn, and light ring

2 Watt Speaker Horn: 85dB SPL at 10ft (3m) 6 RGB Color ring


Wi-Fi connection: 802.11 @ 2.4 GHz Wireless Interconnect: 802.15.4 @ 2.4 GHz Bluetooth Low Energy


Six AA Energizer Ultimate Lithium

System requirements

Wi-Fi internet connection
Phone or tablet running iOS or Android
Nest app (see requirements)

Environmental information

Green Mercury-free PVC-free Recyclable packaging
Operating The alarm should not be installed in locations where the normal ambient temperature is below 40°F (4°C) or exceeds 100°F (38°C). Humidity Range: 20% RH to 80% RH (non condensing).


Pre-installed languages by country United States: English, Spanish Canada: English, French (Québécois) United Kingdom: English (British) France, Belgium and Netherlands: French and Dutch
Note: After setup, you can change the language Nest Protect speaks to any of the other languages.


2-year limited hardware warranty


Nest Protect has been tested to comply with safety standards in the United States and Canada set out by: Underwriters Laboratories Inc. California State Fire Marshal Canadian Standards Association
Nest Protect complies with all of the following smoke and carbon monoxide alarm standards: UL 2034 - ""Single and Multi Station Carbon Monoxide Alarms ""UL 217 - ""Single and Multi Station Smoke Alarms""NFPA-72 - ""National Fire Alarm and Signaling Code"" CSA 6.19-01 - ""Residential carbon monoxide alarming devices"" CAN-ULC-S531-02 ""Standard for Smoke Alarms""

In the box

Nest Protect (Battery)
Six long-life batteries (Energizer® Ultimate Lithium ""L91"" AA)
Back plate
Four screws
User's Guide
Welcome Guide
2-year limited hardware warranty