Winner
Updated October 2026
Data from the official X-Sense site.
2026 verdict
A smoke sensor alongside CO sensing is what puts the X-Sense SC07-MR Smart Smoke & CO Alarm ahead of the X-Sense Wi-Fi Carbon Monoxide Alarm in this pair, and it also runs far longer between battery changes.
It covers fire and carbon monoxide in one ceiling unit, links to other X-Sense alarms over RF, and is rated for five years on its CR123A battery against about one on the X-Sense Wi-Fi Carbon Monoxide Alarm. The X-Sense Wi-Fi Carbon Monoxide Alarm is the dedicated CO monitor, and it answers with a built-in light and a freestanding design that needs no wall mounting, plus direct 2.4 GHz Wi-Fi where the SC07-MR needs an X-Sense base station for its own app features. Both have an LCD, low battery alerts and the same Home Assistant-only integration list. Buy the X-Sense SC07-MR Smart Smoke & CO Alarm for one device watching both hazards, and the X-Sense Wi-Fi Carbon Monoxide Alarm if you already cover smoke and want a shelf-top CO monitor with a light.
Works with
Connectivity
- Wi-Fi 2.4 GHz
vs
Works with
Connectivity
- Wi-Fi 2.4 GHz
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| Feature | X-Sense SC07-MR Smart Smoke & CO Alarm | X-Sense Wi-Fi Carbon Monoxide Alarm | Winner |
|---|---|---|---|
| Battery Life | 5 years | 1 year | X-Sense SC07-MR Smart Smoke & CO Alarm |
| Connectivity | 2.4 GHz WiFi, Other | 2.4 GHz WiFi | X-Sense SC07-MR Smart Smoke & CO Alarm |
| Sensors | Smoke, CO | CO | X-Sense SC07-MR Smart Smoke & CO Alarm |
| Alerts | Fire Alerts, CO Alerts, Low Battery Alerts | CO Alerts, Low Battery Alerts | X-Sense SC07-MR Smart Smoke & CO Alarm |
| Built-in Light | NO | YES | X-Sense Wi-Fi Carbon Monoxide Alarm |
| Rating | 4.6 | 4.6 | Tie |
| Warranty | 5 years | 5 years | Tie |
| Integrations | Home Assistant | Home Assistant | Tie |
| Screen | YES | YES | Tie |
| Built-in Siren | YES | YES | Tie |
| Pathlight | NO | NO | Tie |
| Steam Check | NO | NO | Tie |
What the differences mean
Smoke and fire coverage
The X-Sense SC07-MR Smart Smoke & CO Alarm pairs a photoelectric smoke sensor with its CO cell and raises fire alerts. The X-Sense Wi-Fi Carbon Monoxide Alarm has no smoke sensor and no fire alerts, so it cannot stand in for a smoke detector.
Battery life
Five years on a CR123A battery for the X-Sense SC07-MR Smart Smoke & CO Alarm, against roughly one year for the X-Sense Wi-Fi Carbon Monoxide Alarm. That is the gap you notice in practice, since the short-life unit needs a fresh cell annually.
Interconnection
The SC07-MR links to other X-Sense Link+ alarms over RF, so one detecting smoke sounds the rest. The X-Sense Wi-Fi Carbon Monoxide Alarm is a standalone monitor with no RF link to other alarms.
Light and mounting
The X-Sense Wi-Fi Carbon Monoxide Alarm has a built-in light and a freestanding body that can sit on a surface. The X-Sense SC07-MR Smart Smoke & CO Alarm has no light and is built to be mounted on a ceiling or wall.
Which one to buy if
- you want one alarm watching fire and carbon monoxide
The X-Sense SC07-MR Smart Smoke & CO Alarm carries both a smoke sensor and a CO sensor.
- you already have smoke alarms and only need CO coverage
The X-Sense Wi-Fi Carbon Monoxide Alarm is a dedicated CO monitor, so it complements existing smoke alarms.
- you want to avoid yearly battery swaps
Its battery is rated for five years against about one on the X-Sense Wi-Fi Carbon Monoxide Alarm.
- you want a freestanding monitor with its own light
The X-Sense Wi-Fi Carbon Monoxide Alarm sits on a shelf and includes a built-in light.
Winner
- + Battery Life: 5 years
- + Connectivity: 2.4 GHz WiFi, Other
- + Sensors: Smoke, CO
- - Built-in Light: NO vs YES
15% OFF
£30.59
£35.99
- + Built-in Light: YES
- - Battery Life: 1 year vs 5 years
- - Connectivity: 2.4 GHz WiFi vs 2.4 GHz WiFi, Other
What owners say
X-Sense Wi-Fi Carbon Monoxide Alarm owners describe a quick setup over 2.4 GHz Wi-Fi and the X-Sense app, and they value its freestanding design, which can sit on a shelf or table with no wall work. The loud siren and the large LCD showing the live CO reading come up often, along with real-time phone alerts while they are away. Several bought it for a gas boiler, a wood stove or a rental property, and one owner reports it catching a real gas leak. The recurring complaints are that it detects carbon monoxide only, so a separate smoke alarm is still needed, that it offers no smart home integration or automations, and that the app and instructions are not localized for every market.
Frequently Asked Questions
Which is better overall: X-Sense SC07-MR Smart Smoke & CO Alarm or X-Sense Wi-Fi Carbon Monoxide Alarm?
The X-Sense SC07-MR Smart Smoke & CO Alarm, because it covers both smoke and carbon monoxide in one unit and lasts five years on a battery. The X-Sense Wi-Fi Carbon Monoxide Alarm detects carbon monoxide only, but adds a built-in light and a freestanding design.
What is the biggest difference between the X-Sense SC07-MR Smart Smoke & CO Alarm and the X-Sense Wi-Fi Carbon Monoxide Alarm?
What each one senses. The X-Sense SC07-MR Smart Smoke & CO Alarm combines a photoelectric smoke sensor with an electrochemical CO sensor, while the X-Sense Wi-Fi Carbon Monoxide Alarm has no smoke sensor and no fire alerts at all.
Does either alarm need to be mounted on a wall?
The X-Sense Wi-Fi Carbon Monoxide Alarm is freestanding and can sit on a shelf or table, though it can also be wall mounted. The X-Sense SC07-MR Smart Smoke & CO Alarm is designed as a mounted alarm.
Does either one have a built-in light?
The X-Sense Wi-Fi Carbon Monoxide Alarm has a built-in light, while the X-Sense SC07-MR Smart Smoke & CO Alarm does not.
Who should buy the X-Sense SC07-MR Smart Smoke & CO Alarm?
Anyone who wants a single alarm watching for both fire and carbon monoxide, and who wants years of battery life and RF interconnection with other X-Sense alarms.
Who should buy the X-Sense Wi-Fi Carbon Monoxide Alarm?
Buyers who already have smoke detection covered and want a dedicated, freestanding carbon monoxide monitor with a built-in light and a live readout.
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