Nest Protect Smoke & Carbon Monoxide Detector - Battery
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Nest Protect Smoke & Carbon Monoxide Detector - Battery

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Nest Protect Overview

Nest Protect has been redesigned from the inside out. It has a Split-Spectrum Sensor, tests itself automatically and lasts up to a decade. It’s also the first home alarm you can hush from your phone without any extra hardware required. And it tells you what’s wrong and can even alert your phone. Nest Protect has a friendly human voice that gives you an early warning. That way you can handle burning toast before it becomes a burning toaster. 

No one should be woken up by a low-battery chirp at 2 a.m. When you turn off the lights, look for a quick green glow. That’s our Nightly Promise. It means all your Nest Protects have tested themselves, the batteries are good, and there won’t be any chirps. Sweet dreams.

Nest Protect Features

  • Voice alarms with custom location
  • Split-Spectrum Sensor
  • Detects carbon monoxide
  • 10-year product lifetime
  • Heads-Up alerts
  • Sound Check
  • Nightly Promise
  • Pathlight
  • Steam Check
  • Self Test
  • Wireless Interconnect
  • Emergency Shutoff with Nest Learning Thermostat
  • Emergency clip record with Nest Cam
  • Home Report
  • Nest app
  • Smoke
  • Carbon monoxide
  • Low-battery
  • Sensor & failure

Nest Protect Specifications

Generation 2nd Generation
Power Six long-life AA Energizer® Ultimate Lithium batteries
Color White
Languages English (US, UK)
French (Canada, France)
Sensors Split-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
Omnidirectional microphone, 70dBA SNR
Speaker, horn,
and light ring
2 Watt Speaker
Horn: 85dB SPL at 10 feet (3 m)
RGB color ring with 6 LEDs
Size and weight Height: 5.3 inches (13.4 cm)
Width: 5.3 inches (13.4 cm)
Depth: 1.5 inch (3.85 cm)
Mass: 13.9 ounces (379 g)
Connectivity requirements Wi-Fi connection with internet access
Nest app on phone or tablet with Android or iOS. See the Nest app requirements for supported versions.
Free Nest Account
Wireless Working Wi-Fi connection: 802.11b/g/n @ 2.4GHz
Wireless Interconnect: 802.15.4 @ 2.4GHz
Bluetooth Low Energy (BLE)
Certification Nest 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”
Operating temperature 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).
Green RoHS compliant
REACH compliant
Recyclable packaging
Learn more at
Warranty 2-year limited warranty. For support, visit
Our support team is also available by phone.
In the box Nest Protect (Battery)
Six long-life batteries (Energizer® Ultimate Lithium “L91” AA)
Four screws
User’s Guide and Welcome Guide

Questions & Support

For questions about your Nest Protect, please visit this page.

For general support, installation guides / videos, and to learn how to get the most out of your Nest products, please visit this page.

The contact Nest directly for support, they're available 24/7 at 1-855-469-6378.

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