Google Nest Protect, Line Volt (pro)

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Know more, worry less. Google Nest Protect looks for fast-burning fires, smoldering fires and carbon monoxide. When it senses smoke or CO, it will send an alert to your phone, so you know something is wrong even when you’re away from home. The app alerts you when the batteries are low. You can even hush a false alarm from your phone.


  • Phone alerts include:

- Low-battery

- Smoke & Carbon monoxide

- Sensor failure

  • Split-Spectrum Sensor
  • Spoken Alerts
  • Nest App
  • App Silence
  • Carbon monoxide Detection
  • Nightly Promise
  • 10-year product lifetime
  • Pathlight
  • Safety Checkup
  • Heads-Up alerts
  • Sound Check
  • Steam Check
  • Wireless Interconnect
  • Safety History
  • What To Do
  • Home Report
  • Emergency clip record with Nest Cam
  • Emergency shut-off with Nest Thermostat
  • Family Accounts


  • Split-Spectrum Sensor
  • 10 year electrochemical carbon monoxide sensor
  • Heat sensor, ± 1.8ºF (± 1ºC)
  • Humidity sensor, ± 3%RH
  • Occupancy sensor, 120º field of view to 20 feet
  • Ambient light sensor
  • Omnidirectional microphone, 70dBA SNR

Size and weight

Height: 5.3 in (13.5 cm)

Width: 5.3 in (13.5 cm)

Depth: 1.5 in (3.85 cm)

Mass: 13.2 oz (375 g)

Speaker loudness

80dB @ 3 feet (1 m) @ 1kHz


85dB SPL @ 10 feet (3 m)

Light ring

RGB color ring with 6 LEDs


Out of the box

  • US: English, Spanish
  • Canada: English, French


  • English, French, Spanish, Dutch


  • Working Wi-Fi connection: 802.11 b/g/n @ 2.4GHz
  • Wireless interconnect: 802.15.4b/g/n @ 2.4GHz
  • Bluetooth Low Energy (BLE)


  • Three long-life backup batteries (Energizer® Ultimate Lithium “L91” AA)

Connectivity requirements

  • Wi-Fi connection
  • Phone or tablet with iOS 8 or later, or Android 4 or later
  • Free Nest account


  • The 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).


2-year limited warranty. For help, visit Our support team is also available by phone 24/7.


Google Nest Protect has been tested to comply with safety standards UL 2034, UL 217 and NFPA-72 set out by UL and California State Fire Marshal.

In the box


  • Batteries
  • Backplate
  • Four screws
  • User’s Guide
  • Welcome Guide
  • 120V AC connector
  • Three wire nuts

Part numbers

Description/Part #

  • US Wired White - S3003LWES

Single UPC

  • 854448003730