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Smoke & CO Detectors · Head to head

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

Full Smart Smoke & CO Detectors comparison in 2026

Updated October 2026
Data from Amazon and official Google and X-Sense sites.
2026 verdict
Covering both smoke and carbon monoxide in one ceiling unit, the Google Nest Protect (Battery) is the smoke alarm that speaks the room before the siren.
Google Nest Protect (Battery)
Winner
Google Nest Protect (Battery)
$399.99
Buy on Amazon USACheck price
It tests itself, lights a path, and runs on six AA cells listed at 2 years. The X-Sense Wi-Fi Carbon Monoxide Alarm is a CO-only detector with a live reading on an LCD, a 5 year warranty and no Google Home support. Buy the Google Nest Protect (Battery) when one device has to do both jobs. Buy the X-Sense Wi-Fi Carbon Monoxide Alarm when smoke is already covered and you want a CO display.
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FeatureGoogle Nest Protect (Battery)X-Sense Wi-Fi Carbon Monoxide AlarmWinner
Price$399.99€39.87X-Sense Wi-Fi Carbon Monoxide Alarm
Rating4.44.6X-Sense Wi-Fi Carbon Monoxide Alarm
Warranty2 years5 yearsX-Sense Wi-Fi Carbon Monoxide Alarm
Battery Life2 years1 yearGoogle Nest Protect (Battery)
Connectivity2.4 GHz WiFi, Bluetooth, Other2.4 GHz WiFiGoogle Nest Protect (Battery)
IntegrationsGoogle Home, Home AssistantHome AssistantGoogle Nest Protect (Battery)
ScreenNOYESX-Sense Wi-Fi Carbon Monoxide Alarm
SensorsSmoke, CO, Occupancy, Temperature, Humidity, Ambient Light, MotionCOGoogle Nest Protect (Battery)
AlertsFire Alerts, CO Alerts, Low Battery AlertsCO Alerts, Low Battery AlertsGoogle Nest Protect (Battery)
Tests ItselfYESNOGoogle Nest Protect (Battery)
PathlightYESNOGoogle Nest Protect (Battery)
Steam CheckYESNOGoogle Nest Protect (Battery)

What the differences mean

Both hazards, or CO only

The Google Nest Protect (Battery) detects smoke and carbon monoxide and sends alerts for both. The X-Sense Wi-Fi Carbon Monoxide Alarm detects CO only, shows the reading on an LCD, and has no smoke sensor and no fire alerts. It does not replace a smoke alarm, and the Nest does not show a live CO number on a screen.

Batteries and warranty

The Google Nest Protect (Battery) uses six AA cells with a listed battery life of 2 years, and a 2 year warranty. The summary also describes a sensor life of about 10 years, after which the unit disables itself. The X-Sense Wi-Fi Carbon Monoxide Alarm uses a CR123A listed at 1 year and carries a 5 year warranty, the longer of the two.

Google Home and other platforms

The Google Nest Protect (Battery) lists Google Home and Home Assistant. Alexa, Apple Home, SmartThings and Matter are not supported. The X-Sense Wi-Fi Carbon Monoxide Alarm does not work with Google Home, Alexa, Apple Home, SmartThings or Matter. It does list Home Assistant. Both use 2.4 GHz Wi-Fi. The Nest also has Bluetooth and an 802.15.4 link to other Nest Protects.

Self-test and pathlight

The Google Nest Protect (Battery) tests itself, has a pathlight and Steam Check, and adds occupancy, temperature, humidity, light and motion sensors. The X-Sense Wi-Fi Carbon Monoxide Alarm has a siren and a light, but self-test, pathlight and Steam Check are no, and automations are no. Its advantage on the table is the screen.

Which one to buy if

What owners say

Owners of both alarms praise a loud alert and a setup that did not need an electrician, then they are watching for different gases. Google Nest Protect (Battery) owners single out the spoken warning that names the room in time to silence a cooking false alarm, and phone alerts while they are away, including stories of a real toaster-oven event caught from somewhere else. They warn about a fixed life of about 10 years, stock that can already be old, and the specific lithium AA cells it wants. X-Sense Wi-Fi Carbon Monoxide Alarm owners single out joining 2.4 GHz Wi-Fi in a few minutes, a siren you can hear from other rooms, and a freestanding body that needs no screws. One owner credits it with catching a boiler leak. They accept that it will not hear smoke.

Price history compared

Every price change of both, in the same store, so the gap between the two lines is what one costs more than the other.

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

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Frequently Asked Questions

Which alarm fits, the Google Nest Protect (Battery) or the X-Sense Wi-Fi Carbon Monoxide Alarm?

The Google Nest Protect (Battery), if you need smoke and carbon monoxide together, with a spoken warning, self-tests and a pathlight. The X-Sense Wi-Fi Carbon Monoxide Alarm is the specialist CO detector with an LCD and a 5 year warranty, and it does not detect smoke.

Does the X-Sense Wi-Fi Carbon Monoxide Alarm work with Google Home?

No. The X-Sense Wi-Fi Carbon Monoxide Alarm does not support Google Home, Alexa, Apple Home, SmartThings or Matter. It does list Home Assistant. The Google Nest Protect (Battery) does support Google Home and Home Assistant, and it does not support Alexa, Apple Home, SmartThings or Matter.

What is the biggest difference between the Google Nest Protect (Battery) and the X-Sense Wi-Fi Carbon Monoxide Alarm?

Coverage. The Google Nest Protect (Battery) is a smoke and CO alarm with no numeric display. The X-Sense Wi-Fi Carbon Monoxide Alarm is CO only and shows the level on an LCD. The Nest also has a pathlight and self-tests. The X-Sense has the longer warranty, 5 years against 2.

Can the X-Sense Wi-Fi Carbon Monoxide Alarm replace a smoke alarm?

No. It has no smoke sensor and no fire alerts. Keep a smoke alarm, such as the Google Nest Protect (Battery) if you want both hazards in one unit, and use the X-Sense where a gas appliance needs a dedicated CO reading.

Who should buy the Google Nest Protect (Battery)?

Homes without alarm wiring that want spoken warnings, phone alerts, a pathlight and both smoke and CO sensing from six AA cells. Check the manufacture date, because the sensor life is about 10 years from then.

Who should buy the X-Sense Wi-Fi Carbon Monoxide Alarm?

Households with a boiler, wood stove or attached garage who already have smoke alarms and want a loud CO detector with a live LCD and phone alerts. Do not expect Google Home or voice routines.

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