First Alert SMCO410 Smoke Detector & CO Alarm vs X-Sense Wi-Fi Smoke Alarm

Updated October 2026

Data from the official First Alert and X-Sense sites.

2026 verdict

It is Wi-Fi convenience against Z-Wave integration, and the First Alert SMCO410 Smoke Detector & CO Alarm comes out ahead of the X-Sense Wi-Fi Smoke Alarm on protection: it senses carbon monoxide as well as smoke.

Winner

First Alert SMCO410 Smoke Detector & CO Alarm

$64.98

Buy on Amazon USA

It also carries a 10 year warranty against 5, sends CO alerts, has steam check for cooking nuisance alarms and works with SmartThings and Home Assistant. The X-Sense Wi-Fi Smoke Alarm is the better reviewed of the two, adds a built-in light, weighs 92 g and needs no hub, since it connects straight to 2.4 GHz Wi-Fi. Both list about 10 years of battery life, and neither has Alexa, Google Home, Apple Home or Matter. Choose the First Alert SMCO410 Smoke Detector & CO Alarm if you already run a Z-Wave hub, and the X-Sense Wi-Fi Smoke Alarm for a simple hub-free smoke alarm.

Winner

First Alert

#3 Best Seller in Smoke & CO Detectors

First Alert SMCO410 Smoke Detector & CO Alarm

$64.98

Buy on Amazon USA

X-Sense

X-Sense Wi-Fi Smoke Alarm

€51.76

Buy on Amazon Ireland

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Feature	First Alert SMCO410 Smoke Detector & CO Alarm	X-Sense Wi-Fi Smoke Alarm	Winner
Price	$64.98	€51.76	X-Sense Wi-Fi Smoke Alarm
Rating	3.5	4.3	X-Sense Wi-Fi Smoke Alarm
Warranty	10 years	5 years	First Alert SMCO410 Smoke Detector & CO Alarm
Integrations	Samsung SmartThings, Home Assistant	Home Assistant	First Alert SMCO410 Smoke Detector & CO Alarm
Sensors	Smoke, CO	Smoke	First Alert SMCO410 Smoke Detector & CO Alarm
Alerts	Fire Alerts, CO Alerts, Low Battery Alerts	Fire Alerts, Low Battery Alerts	First Alert SMCO410 Smoke Detector & CO Alarm
Built-in Light	NO	YES	X-Sense Wi-Fi Smoke Alarm
Steam Check	YES	NO	First Alert SMCO410 Smoke Detector & CO Alarm
Battery Life	10 years	10 years	Tie
Connectivity	Z-Wave	2.4 GHz WiFi	Tie
Screen	NO	NO	Tie
Built-in Siren	YES	YES	Tie

What the differences mean

Carbon monoxide

The First Alert SMCO410 Smoke Detector & CO Alarm senses smoke and carbon monoxide and sends alerts for both. The X-Sense Wi-Fi Smoke Alarm detects smoke only, so a CO detector has to be added next to it.

How it connects

The First Alert SMCO410 Smoke Detector & CO Alarm uses Z-Wave and needs a Z-Wave hub, with no Wi-Fi and no app of its own. The X-Sense Wi-Fi Smoke Alarm joins 2.4 GHz Wi-Fi and needs no hub, which makes it the easier one to set up alone.

Platforms

The First Alert SMCO410 Smoke Detector & CO Alarm works with SmartThings and Home Assistant. The X-Sense Wi-Fi Smoke Alarm lists Home Assistant only. Neither supports Alexa, Google Home, Apple Home or Matter.

Battery and size

Both are rated for 10 years, but the First Alert SMCO410 Smoke Detector & CO Alarm uses a sealed lithium battery and weighs 280 g, while the X-Sense Wi-Fi Smoke Alarm uses a replaceable CR123A and weighs 92 g.

Warranty and light

10 years of warranty for the First Alert SMCO410 Smoke Detector & CO Alarm against 5 for the X-Sense Wi-Fi Smoke Alarm, which is the only one with a built-in light.

Which one to buy if

you want one alarm for smoke and carbon monoxide
First Alert SMCO410 Smoke Detector & CO Alarm
Only the First Alert SMCO410 Smoke Detector & CO Alarm has a CO sensor.
you have no hub and want the simplest setup
X-Sense Wi-Fi Smoke Alarm
The X-Sense Wi-Fi Smoke Alarm connects directly over 2.4 GHz Wi-Fi with its own app.
you run a Z-Wave hub, SmartThings or Ring Alarm
First Alert SMCO410 Smoke Detector & CO Alarm
The First Alert SMCO410 Smoke Detector & CO Alarm joins the Z-Wave mesh so a fire can trigger automations.
you want the alarm to light up the room
X-Sense Wi-Fi Smoke Alarm
The X-Sense Wi-Fi Smoke Alarm has a built-in light and the First Alert SMCO410 Smoke Detector & CO Alarm does not.

Winner

First Alert

First Alert SMCO410 Smoke Detector & CO Alarm

$64.98

Buy on Amazon USA

+ Warranty: 10 years
+ Integrations: Samsung SmartThings, Home Assistant
+ Sensors: Smoke, CO
- Price: $64.98 vs €51.76
- Rating: 3.5 vs 4.3

X-Sense

X-Sense Wi-Fi Smoke Alarm

€51.76

Buy on Amazon Ireland

+ Price: €51.76
+ Rating: 4.3
+ Built-in Light: YES
- Warranty: 5 years vs 10 years
- Integrations: Home Assistant vs Samsung SmartThings, Home Assistant

What owners say

X-Sense Wi-Fi Smoke Alarm owners consistently talk about how quickly it goes online: download the app, join a 2.4 GHz network and it is running in minutes with no hub. They praise the loud siren, the real-time phone alerts that reassure them when they are away and a solid build, and some point to the replaceable battery as a practical plus over sealed alarms. Their caveats are consistent too: there is no carbon monoxide sensor, so they add a separate CO detector, there is no automatic self-test and the app is English only for some buyers. Owners use it in homes with wood stoves, in rentals and as an upgrade from an older alarm that had no connectivity at all.

Frequently Asked Questions

Which is better overall: First Alert SMCO410 Smoke Detector & CO Alarm or X-Sense Wi-Fi Smoke Alarm?

The First Alert SMCO410 Smoke Detector & CO Alarm, because it detects carbon monoxide too and has a 10 year warranty. The X-Sense Wi-Fi Smoke Alarm is the simpler, hub-free and better reviewed option for smoke only.

Does the X-Sense Wi-Fi Smoke Alarm detect carbon monoxide?

No, it detects smoke only and has no CO alerts. The First Alert SMCO410 Smoke Detector & CO Alarm detects both.

Does the First Alert SMCO410 Smoke Detector & CO Alarm need a hub?

Yes. It is a Z-Wave device with no Wi-Fi, so it needs a Z-Wave hub such as SmartThings, Ring Alarm or Home Assistant. The X-Sense Wi-Fi Smoke Alarm needs no hub.

What is the biggest difference between the First Alert SMCO410 Smoke Detector & CO Alarm and the X-Sense Wi-Fi Smoke Alarm?

Coverage and connection. The First Alert SMCO410 Smoke Detector & CO Alarm covers smoke and CO over Z-Wave, while the X-Sense Wi-Fi Smoke Alarm covers smoke over Wi-Fi.

Who should buy the First Alert SMCO410 Smoke Detector & CO Alarm?

Z-Wave households that want smoke and CO in one alarm, with alerts inside their hub and a decade without battery changes.

Who should buy the X-Sense Wi-Fi Smoke Alarm?

Buyers who want a simple connected smoke alarm with phone alerts and a light, without a hub, and who cover carbon monoxide separately.

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First Alert SMCO410 Smoke Detector & CO Alarm vs X-Sense Wi-Fi Smoke Alarm

First Alert SMCO410 Smoke Detector & CO Alarm

X-Sense Wi-Fi Smoke Alarm

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What the differences mean

Carbon monoxide

How it connects

Platforms

Battery and size

Warranty and light

Which one to buy if

First Alert SMCO410 Smoke Detector & CO Alarm

X-Sense Wi-Fi Smoke Alarm

What owners say

Frequently Asked Questions

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