The Smart Device Compare comparison

Google Nest Protect (Battery) vs X-Sense Wi-Fi Carbon Monoxide Alarm

Understand the differences. Decide what matters to your home.

Before you compare every specification

Key differences between Google Nest Protect (Battery) and X-Sense Wi-Fi Carbon Monoxide Alarm

A summary of selected recorded differences between these smoke & co detectors. Check the full specification table below for details and conditions.

Feature differences among your selected devices

Fire Alerts (alerts): Google Nest Protect (Battery) — Yes; X-Sense Wi-Fi Carbon Monoxide Alarm — No.
Bluetooth (connectivity): Google Nest Protect (Battery) — Yes; X-Sense Wi-Fi Carbon Monoxide Alarm — No.
Screen (display): Google Nest Protect (Battery) — No; X-Sense Wi-Fi Carbon Monoxide Alarm — Yes.
Pathlight (features): Google Nest Protect (Battery) — Yes (When you walk under Nest Protect at night, it will light your way. You can choose different light levels or turn Pathlight off entirely in the app.); X-Sense Wi-Fi Carbon Monoxide Alarm — No.

Specifications to check side by side

Other (connectivity): Google Nest Protect (Battery) — 802.15.4 wireless interconnect (Nest Weave interconnect between Protects, keeps working without Wi-Fi); X-Sense Wi-Fi Carbon Monoxide Alarm — No.
Battery Life (power): Google Nest Protect (Battery) — 2 years; X-Sense Wi-Fi Carbon Monoxide Alarm — 1 year.
Battery Type (power): Google Nest Protect (Battery) — 6x AA; X-Sense Wi-Fi Carbon Monoxide Alarm — CR123A.

Information still to confirm

1 of 37 comparison fields lack a resolved value for at least one selected device. Missing information is not evidence that a feature is absent.
Check the full table and manufacturer documentation before ruling out a device.

These observations are derived from recorded catalog data and have not all been independently verified. Confirm details with the manufacturer before purchasing.

Compare capabilities, compatibility and setup requirements.

Option 1 · Google

Google Nest Protect (Battery)

Last updated September 2026

View full device profile

Option 2 · X-Sense

X-Sense Wi-Fi Carbon Monoxide Alarm

Last updated October 2026

View full device profile

What the catalog tells us

Understand the tradeoffs.

These counts describe the available data, not a quality score. More features do not automatically make a better device.

16differences with recorded values for every device

1rows with missing or unspecified information

Consider your setup

Battery Life

Google Nest Protect (Battery)2 years
X-Sense Wi-Fi Carbon Monoxide Alarm1 year

Compare the stated test conditions. Catalog battery figures alone do not predict runtime in your home.

Inspect the specifications

Your priorities, side by side

Focus on what changes.

Mark the specifications you care about. Open manufacturer sources for verification scope; fields without citations remain catalog data. Expand notes for other qualifications.

Differences onlyMy priorities (0)

Showing 37 of 37 rows. “Not recorded” does not mean “No”.

Reading layout

Alerts

Air Quality Alerts

Google Nest Protect (Battery): No
X-Sense Wi-Fi Carbon Monoxide Alarm: No

Co Alerts

Google Nest Protect (Battery): Yes
Catalog note
Carbon monoxide is poisonous but you can't see it or smell it. Nest Protect has a carbon monoxide sensor available that lasts 10 years.
X-Sense Wi-Fi Carbon Monoxide Alarm: Yes

Fire Alerts

Google Nest Protect (Battery): Yes
X-Sense Wi-Fi Carbon Monoxide Alarm: No

Low Battery Alerts

Google Nest Protect (Battery): Yes
X-Sense Wi-Fi Carbon Monoxide Alarm: Yes

Temperature Alerts

Google Nest Protect (Battery): No
X-Sense Wi-Fi Carbon Monoxide Alarm: No

Connectivity

2.4 GHz Wi-Fi

Google Nest Protect (Battery): Yes
X-Sense Wi-Fi Carbon Monoxide Alarm: Yes
Catalog note
IEEE 802.11b/g/n

5 GHz Wi-Fi

Google Nest Protect (Battery): No
X-Sense Wi-Fi Carbon Monoxide Alarm: No

Bluetooth

Google Nest Protect (Battery): Yes
X-Sense Wi-Fi Carbon Monoxide Alarm: No

Other

Google Nest Protect (Battery): 802.15.4 wireless interconnect
Catalog note
Nest Weave interconnect between Protects, keeps working without Wi-Fi
X-Sense Wi-Fi Carbon Monoxide Alarm: No

Thread

Google Nest Protect (Battery): No
X-Sense Wi-Fi Carbon Monoxide Alarm: No

Z Wave

Google Nest Protect (Battery): No
X-Sense Wi-Fi Carbon Monoxide Alarm: No

Zigbee

Google Nest Protect (Battery): No
X-Sense Wi-Fi Carbon Monoxide Alarm: No

Display

Screen

Google Nest Protect (Battery): No
X-Sense Wi-Fi Carbon Monoxide Alarm: Yes

Screen Type

Google Nest Protect (Battery): Not applicable / unspecified
X-Sense Wi-Fi Carbon Monoxide Alarm: LCD
Catalog note
The large LCD indicates how much carbon monoxide the alarm is detecting, ranging from 30 to 999 ppm.

Features

Automations

Google Nest Protect (Battery): No
X-Sense Wi-Fi Carbon Monoxide Alarm: No

Built In Light

Google Nest Protect (Battery): Yes
X-Sense Wi-Fi Carbon Monoxide Alarm: Yes

Built In Siren

Google Nest Protect (Battery): Yes
X-Sense Wi-Fi Carbon Monoxide Alarm: Yes

Pathlight

Google Nest Protect (Battery): Yes
Catalog note
When you walk under Nest Protect at night, it will light your way. You can choose different light levels or turn Pathlight off entirely in the app.
X-Sense Wi-Fi Carbon Monoxide Alarm: No

Steam Check

Google Nest Protect (Battery): Yes
Catalog note
Has your alarm ever yelled at you for taking a shower? Nest Protect uses custom algorithms and a humidity sensor to look for steam, so you can enjoy a nice, quiet shower.
X-Sense Wi-Fi Carbon Monoxide Alarm: No

Tests Itself

Google Nest Protect (Battery): Yes
Catalog note
Nest Protect checks its batteries and sensors over 400 times a day. And it uses Sound Check to quietly test its speaker and horn once a month
X-Sense Wi-Fi Carbon Monoxide Alarm: No

Integrations

Alexa

Google Nest Protect (Battery): No
Catalog note
Nest Protect has never been exposed to Alexa: Google keeps it inside the Google Home app
X-Sense Wi-Fi Carbon Monoxide Alarm: No
Catalog note
X-Sense confirms its smoke and CO alarms do not work with Alexa: only the AS05 and AS08 security kits are Alexa compatible, and Alexa's API has no smoke or CO alarm type anyway

Apple Home

Google Nest Protect (Battery): No
X-Sense Wi-Fi Carbon Monoxide Alarm: No

Google Home

Google Nest Protect (Battery): Yes
X-Sense Wi-Fi Carbon Monoxide Alarm: No

Home Assistant

Google Nest Protect (Battery): Yes
X-Sense Wi-Fi Carbon Monoxide Alarm: Yes
Catalog note
Community X-Sense integration for Home Assistant (HACS), which lists this model and reads it from the X-Sense cloud account

Matter

Google Nest Protect (Battery): No
X-Sense Wi-Fi Carbon Monoxide Alarm: No

SmartThings

Google Nest Protect (Battery): No
X-Sense Wi-Fi Carbon Monoxide Alarm: No

Power

Battery Life

Google Nest Protect (Battery): 2 years
X-Sense Wi-Fi Carbon Monoxide Alarm: 1 year

Battery Type

Google Nest Protect (Battery): 6x AA
X-Sense Wi-Fi Carbon Monoxide Alarm: CR123A

Wired

Google Nest Protect (Battery): No
X-Sense Wi-Fi Carbon Monoxide Alarm: No

Sensors

Air Quality

Google Nest Protect (Battery): No
X-Sense Wi-Fi Carbon Monoxide Alarm: No

Ambient Light

Google Nest Protect (Battery): Yes
Catalog note
Detect when the room is dark so it can automatically turn on the Pathlight and Nightly Promise features.
X-Sense Wi-Fi Carbon Monoxide Alarm: No

Google Nest Protect (Battery): Yes
X-Sense Wi-Fi Carbon Monoxide Alarm: Yes

Humidity

Google Nest Protect (Battery): Yes
Catalog note
Enables the Steam Check feature to reduce nuisance alarms caused by things like steam from your shower.
X-Sense Wi-Fi Carbon Monoxide Alarm: No

Motion

Google Nest Protect (Battery): Yes
X-Sense Wi-Fi Carbon Monoxide Alarm: No

Occupancy

Google Nest Protect (Battery): Yes
X-Sense Wi-Fi Carbon Monoxide Alarm: No

Smoke

Google Nest Protect (Battery): Yes
X-Sense Wi-Fi Carbon Monoxide Alarm: No

Temperature

Google Nest Protect (Battery): Yes
Catalog note
Detect sudden rises in room temperature.
X-Sense Wi-Fi Carbon Monoxide Alarm: No

Specifications for Google Nest Protect (Battery) versus X-Sense Wi-Fi Carbon Monoxide Alarm
Specification	Google Nest Protect (Battery)	X-Sense Wi-Fi Carbon Monoxide Alarm
Alerts
Air Quality Alerts	No	No
Co Alerts	Yes Catalog note Carbon monoxide is poisonous but you can't see it or smell it. Nest Protect has a carbon monoxide sensor available that lasts 10 years.	Yes
Fire Alerts	Yes	No
Low Battery Alerts	Yes	Yes
Temperature Alerts	No	No
Connectivity
2.4 GHz Wi-Fi	Yes	Yes Catalog note IEEE 802.11b/g/n
5 GHz Wi-Fi	No	No
Bluetooth	Yes	No
Other	802.15.4 wireless interconnect Catalog note Nest Weave interconnect between Protects, keeps working without Wi-Fi	No
Thread	No	No
Z Wave	No	No
Zigbee	No	No
Display
Screen	No	Yes
Screen Type	Not applicable / unspecified	LCD Catalog note The large LCD indicates how much carbon monoxide the alarm is detecting, ranging from 30 to 999 ppm.
Features
Automations	No	No
Built In Light	Yes	Yes
Built In Siren	Yes	Yes
Pathlight	Yes Catalog note When you walk under Nest Protect at night, it will light your way. You can choose different light levels or turn Pathlight off entirely in the app.	No
Steam Check	Yes Catalog note Has your alarm ever yelled at you for taking a shower? Nest Protect uses custom algorithms and a humidity sensor to look for steam, so you can enjoy a nice, quiet shower.	No
Tests Itself	Yes Catalog note Nest Protect checks its batteries and sensors over 400 times a day. And it uses Sound Check to quietly test its speaker and horn once a month	No
Integrations
Alexa	No Catalog note Nest Protect has never been exposed to Alexa: Google keeps it inside the Google Home app	No Catalog note X-Sense confirms its smoke and CO alarms do not work with Alexa: only the AS05 and AS08 security kits are Alexa compatible, and Alexa's API has no smoke or CO alarm type anyway
Apple Home	No	No
Google Home	Yes	No
Home Assistant	Yes	Yes Catalog note Community X-Sense integration for Home Assistant (HACS), which lists this model and reads it from the X-Sense cloud account
Matter	No	No
SmartThings	No	No
Power
Battery Life	2 years	1 year
Battery Type	6x AA	CR123A
Wired	No	No
Sensors
Air Quality	No	No
Ambient Light	Yes Catalog note Detect when the room is dark so it can automatically turn on the Pathlight and Nightly Promise features.	No
Co	Yes	Yes
Humidity	Yes Catalog note Enables the Steam Check feature to reduce nuisance alarms caused by things like steam from your shower.	No
Motion	Yes	No
Occupancy	Yes	No
Smoke	Yes	No
Temperature	Yes Catalog note Detect sudden rises in room temperature.	No

Know what’s behind the comparison.

The table matches specifications by section and field. It preserves notes, separates missing data from explicit “No” values, and keeps qualifications attached to their values. No overall winner is assigned from feature counts.

Read our comparison methodology