Winner
Updated October 2026
Data from the official X-Sense site.
2026 verdict
A combined smoke and CO sensor makes the X-Sense WiFi Smoke & CO Detector the better-rounded alarm of these two, and it also carries the stronger owner feedback.
It watches for both fire and carbon monoxide from one ceiling unit, adds a built-in light, and its alerts cover fire, CO and low battery. The X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts is the sensor specialist instead: it is CO-only, with no smoke sensor or fire alerts, but it adds temperature and humidity readings and spoken voice alerts that name the alarm and its location. Both are standalone 2.4 GHz Wi-Fi alarms with an LCD, a replaceable CR123A battery and a five-year warranty, and neither works with Alexa, Google Home, Apple HomeKit, SmartThings or Matter. Choose the X-Sense WiFi Smoke & CO Detector as a single unit covering both hazards, and the X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts if you already have smoke alarms and want climate sensing plus voice.
Works with
Connectivity
- Wi-Fi 2.4 GHz
vs
Connectivity
- Wi-Fi 2.4 GHz
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| Feature | X-Sense WiFi Smoke & CO Detector | X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts | Winner |
|---|---|---|---|
| Price | £45.17 | £27.71 | X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts |
| Rating | 4.7 | 4.4 | X-Sense WiFi Smoke & CO Detector |
| Sensors | Smoke, CO | CO, Temperature, Humidity | X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts |
| Alerts | Fire Alerts, CO Alerts, Low Battery Alerts | CO Alerts, Low Battery Alerts | X-Sense WiFi Smoke & CO Detector |
| Built-in Light | YES | NO | X-Sense WiFi Smoke & CO Detector |
| Warranty | 5 years | 5 years | Tie |
| Battery Life | 1 year | 1 year | Tie |
| Connectivity | 2.4 GHz WiFi | 2.4 GHz WiFi | Tie |
| Integrations | Home Assistant | None | Tie |
| Screen | YES | YES | Tie |
| Built-in Siren | YES | YES | Tie |
| Tests Itself | NO | NO | Tie |
What the differences mean
Smoke coverage
The X-Sense WiFi Smoke & CO Detector carries both a photoelectric smoke sensor and an electrochemical CO sensor, so it raises fire alerts and CO alerts. The X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts is CO-only: no smoke sensor, no fire alerts, so it belongs next to a smoke alarm rather than instead of one.
Extra sensing and voice
The X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts adds ambient temperature and humidity on top of carbon monoxide, and speaks its alerts aloud, naming the alarm and its location. The X-Sense WiFi Smoke & CO Detector sticks to smoke and CO, and warns with a siren and a light instead.
Built-in light
The X-Sense WiFi Smoke & CO Detector has a built-in light. The X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts has none, and shows status through an LED indicator and its backlit LCD.
Alert range
The X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts covers more situations: alarms, danger cleared, low battery, a fault, end of life and a CO precaution warning before the full threshold. The X-Sense WiFi Smoke & CO Detector focuses on fire, CO and low battery alerts.
Home Assistant
Home Assistant support is listed for the X-Sense WiFi Smoke & CO Detector. For the X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts it is not documented, which matters if that is how you plan to automate the alarm.
Which one to buy if
- you want one alarm covering both fire and carbon monoxide
The X-Sense WiFi Smoke & CO Detector has both sensors, while the XC0M-iR watches carbon monoxide only.
- you already have smoke alarms and want climate readings too
The X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts adds temperature and humidity to its CO sensor.
- you prefer spoken alerts over a beeping siren
The XC0M-iR announces the alarm and its location aloud, a feature the X-Sense WiFi Smoke & CO Detector does not offer.
- you want a built-in light on the alarm
The X-Sense WiFi Smoke & CO Detector includes one; the XC0M-iR does not.
Winner
£45.17
- + Rating: 4.7
- + Alerts: Fire Alerts, CO Alerts, Low Battery Alerts
- + Built-in Light: YES
- - Price: £45.17 vs £27.71
- - Sensors: Smoke, CO vs CO, Temperature, Humidity
16% OFF
£27.71
£32.99
- + Price: £27.71
- + Sensors: CO, Temperature, Humidity
- - Rating: 4.4 vs 4.7
- - Alerts: CO Alerts, Low Battery Alerts vs Fire Alerts, CO Alerts, Low Battery Alerts
What owners say
Owners of both alarms describe an app setup that takes minutes over 2.4 GHz Wi-Fi, and both groups value getting push alerts on a phone while away. X-Sense WiFi Smoke & CO Detector owners praise the combined smoke and CO sensing, an LCD they can read without a backlight, the loud siren and the built-in light, and several mention a fast, free warranty replacement; their gripes are its size and a bracket that is awkward to level. X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts owners single out the spoken alerts that announce the alarm and its location and the temperature and humidity readout; they warn that the climate graphs lag the live reading, that the small display is hard to read from an angle, and that the unit does not interconnect with other alarms.
Frequently Asked Questions
Which is better overall: X-Sense WiFi Smoke & CO Detector or X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts?
The X-Sense WiFi Smoke & CO Detector, for covering both hazards from one unit. It senses smoke and carbon monoxide, has a built-in light and carries the stronger owner feedback. The X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts wins on sensing, adding temperature, humidity and spoken alerts.
What is the biggest difference between the X-Sense WiFi Smoke & CO Detector and the X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts?
Smoke coverage. The X-Sense WiFi Smoke & CO Detector detects both smoke and carbon monoxide and raises fire alerts. The X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts is CO-only, with no smoke sensor and no fire alerts.
Does the X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts detect smoke?
No. The X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts is a dedicated carbon monoxide alarm, so it should be paired with a separate smoke alarm. The X-Sense WiFi Smoke & CO Detector is the one of the two that handles smoke as well.
Do both alarms have a screen?
Yes. Both the X-Sense WiFi Smoke & CO Detector and the X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts use an LCD. The XC0M-iR also scrolls temperature and humidity and shows a stored CO peak.
Who should buy the X-Sense WiFi Smoke & CO Detector?
Households that want one Wi-Fi alarm covering smoke and carbon monoxide, with a built-in light and Home Assistant support.
Who should buy the X-Sense XC0M-iR Smart Carbon Monoxide Alarm with Voice Alerts?
Buyers who already have smoke coverage and want a CO alarm that also reads temperature and humidity and speaks its alerts aloud.
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