Please login to display your prices

Nest Protect WiFi Smoke & Carbon Monoxide (2nd Gen) - Battery
Click image to open expanded view


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 is equipped with six long-lasting AA lithium-ion batteries for long operating life.

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.
  • Nightly Promise lets you know all is working well with a quick flash of green glow when you turn out the lights.
  • Pathlight senses motion and 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.
  • Powered by six AA lithium-ion batteries (included).
  • 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.
  • Warranty: 2 years


SensorsSplit-Spectrum Sensor, 450nm and 880nm wavelength
10 year electrochemical carbon monoxide sensor
Heat sensor, ± 1.8°F (± 1°C)
Humidity sensor, ± 3%RH
Occupancy sensor, 120° field of view to 20 feet
Ambient light sensor, 1-100k Lux Dynamic Range
Omni directional microphone, 70dBA SNR
Speaker, Horn & Light Ring2 Watt Speaker
Horn: 85dB SPL at 10 feet (3 m)
RGB color ring with 6 LEDs
WirelessWorking Wi-Fi connection: 802.11b/g/n @ 2.4GHz
Wireless Interconnect: 802.15.4 @ 2.4GHz
Bluetooth Low Energy (BLE)
PowerSix long-life AA Energizer Ultimate Lithium batteries
LanguagesPre-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 above languages.
Operating TemperatureThe alarm should not be installed in locations where the normal ambient temperature is below 40ºF (4ºC) or exceeds 100ºF (38ºC).
Humidity range: 20%RH to 80%RH (non condensing).
CertificationsNest Protect has been tested to comply with safety standards in the United States set out by:
California State Fire Marshal
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""
Dimensions5.3"" x 5.3"" x 1.5"" (HxWxD)
Weight13.9 oz
Warranty2-Year Limited Manufacturer Warranty