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Smoke & CO Detectors · Head to head

Google Nest Protect (Wired) 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
Two hazards in one unit versus CO alone: the Google Nest Protect (Wired) is the stronger alarm here, since it covers smoke as well as carbon monoxide and runs on house power.
Google Nest Protect (Wired)
Winner
Google Nest Protect (Wired)
$499.99
Buy on Amazon USACheck price
It adds occupancy, motion, temperature, humidity and light sensing, tests itself, lights a pathlight at night, uses Steam Check to cut shower and cooking false alarms, and works with Google Home and Home Assistant. The X-Sense Wi-Fi Carbon Monoxide Alarm wins on two points: an LCD that shows the live CO reading and a 5-year warranty against 2 years for the Nest, and it sits freestanding on a shelf with no wiring at all. It detects carbon monoxide only, though, so it cannot stand in for a smoke alarm. Choose the Google Nest Protect (Wired) if you have alarm wiring and want one device for smoke and CO, and the X-Sense Wi-Fi Carbon Monoxide Alarm as an affordable CO add-on next to smoke alarms you already own.
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FeatureGoogle Nest Protect (Wired)X-Sense Wi-Fi Carbon Monoxide AlarmWinner
Price$499.99€39.87X-Sense Wi-Fi Carbon Monoxide Alarm
Warranty2 years5 yearsX-Sense Wi-Fi Carbon Monoxide Alarm
Connectivity2.4 GHz WiFi, Bluetooth, Other2.4 GHz WiFiGoogle Nest Protect (Wired)
IntegrationsGoogle Home, Home AssistantHome AssistantGoogle Nest Protect (Wired)
ScreenNOYESX-Sense Wi-Fi Carbon Monoxide Alarm
SensorsSmoke, CO, Occupancy, Temperature, Humidity, Ambient Light, MotionCOGoogle Nest Protect (Wired)
AlertsFire Alerts, CO Alerts, Low Battery AlertsCO Alerts, Low Battery AlertsGoogle Nest Protect (Wired)
Tests ItselfYESNOGoogle Nest Protect (Wired)
PathlightYESNOGoogle Nest Protect (Wired)
Steam CheckYESNOGoogle Nest Protect (Wired)
Rating4.64.6Tie
Built-in SirenYESYESTie

What the differences mean

Smoke and CO or CO only

The Google Nest Protect (Wired) detects smoke and carbon monoxide and sends both kinds of alert. The X-Sense Wi-Fi Carbon Monoxide Alarm detects only carbon monoxide, so a home that buys it still needs smoke alarms.

Power

The Google Nest Protect (Wired) runs on your home's alarm wiring with 3 AA batteries as backup, so there are no routine battery swaps. The X-Sense Wi-Fi Carbon Monoxide Alarm runs on a CR123A battery and needs no wiring, which makes it easy to place anywhere.

Google Home

The Google Nest Protect (Wired) works with Google Home and Home Assistant. The X-Sense Wi-Fi Carbon Monoxide Alarm lists Home Assistant only, with no Google Home, Alexa or HomeKit.

Screen versus spoken alerts

The X-Sense Wi-Fi Carbon Monoxide Alarm has an LCD with the current CO reading. The Google Nest Protect (Wired) has no screen but self-tests, adds a pathlight and uses Steam Check to avoid false alarms from steam.

Warranty

X-Sense covers its CO alarm for 5 years, Google covers the Nest Protect for 2.

Which one to buy if

Winner
Google

Google Nest Protect (Wired)

Prime exclusive deal
$499.99
Buy on Amazon USACheck price
  • + Connectivity: 2.4 GHz WiFi, Bluetooth, Other
  • + Integrations: Google Home, Home Assistant
  • + Sensors: Smoke, CO, Occupancy, Temperature, Humidity, Ambient Light, Motion
  • - Price: $499.99 vs €39.87
  • - Warranty: 2 years vs 5 years

What owners say

Both groups rate their alarm's phone alerts as the reason they bought a connected one, and both praise a quick setup. Google Nest Protect (Wired) owners single out never changing batteries, the spoken warning that names the room before the horn, the monthly self-test report and units that sound together even with Wi-Fi down. Their complaints are that it only interconnects with other Nest Protects, that it is expensive, and that it has no Alexa or HomeKit. X-Sense Wi-Fi Carbon Monoxide Alarm owners, many with gas boilers or wood stoves, value the live CO number on the screen and a freestanding unit that needs no wall work, and one credits it with catching a real leak. What they mention against it is an app not localised everywhere and phone alerts that can lag a little behind the screen.

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 (Wired)
  • X-Sense Wi-Fi Carbon Monoxide Alarm

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Frequently Asked Questions

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

No. The X-Sense Wi-Fi Carbon Monoxide Alarm has no Google Home integration; it sends alerts through its own app and lists Home Assistant as its only smart home platform. The Google Nest Protect (Wired) is the one of the two that works with Google Home.

Which is better: Google Nest Protect (Wired) or X-Sense Wi-Fi Carbon Monoxide Alarm?

The Google Nest Protect (Wired), because it detects smoke and carbon monoxide, runs on house power, tests itself and works with Google Home. The X-Sense Wi-Fi Carbon Monoxide Alarm is the better buy only if you need CO detection alone, with a live reading and a 5-year warranty.

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

No. The X-Sense Wi-Fi Carbon Monoxide Alarm has no smoke sensor and raises no fire alerts. The Google Nest Protect (Wired) covers both smoke and carbon monoxide in one unit.

Does the Google Nest Protect (Wired) need batteries?

Only as backup. The Google Nest Protect (Wired) runs on house power and uses 3 AA batteries to keep working during an outage. The X-Sense Wi-Fi Carbon Monoxide Alarm runs entirely on a CR123A battery.

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

Households with gas appliances, a wood stove or an attached garage that already have smoke alarms and want CO coverage with phone alerts. The X-Sense Wi-Fi Carbon Monoxide Alarm is freestanding, so it also suits rentals and holiday homes.

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