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Last updated November 2026

First Alert SMCO410 Smoke Detector & CO Alarm

Smoke and carbon monoxide in one sealed ten-year unit that joins Ring Alarm, Hubitat and Home Assistant easily, but draws complaints about false alarms and early failures.

3.5
280 ratings

#4 Top Rated in Smoke & CO Detectors

$64.93
As an Amazon Associate I earn from qualifying purchases
Launch Year: 2025

Model: SMCO410

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Our review

First Alert SMCO410 Review: A Z-Wave Smoke and CO Alarm That Ring and Home Assistant Owners Like, With Reliability Doubts

The verdict

The First Alert SMCO410 is a battery-powered combination smoke and carbon monoxide alarm that talks Z-Wave. Owners who run Ring Alarm, Home Assistant or Hubitat mostly find it easy to add once they follow the pairing steps, and some report fewer cooking false alarms than the older model it replaces. The recurring complaints are units that fail or false-alarm within a year or two, the sealed battery that cannot be swapped, a higher price, and pairing trouble with SmartThings hubs. Buy it for a Ring or Home Assistant setup and keep the receipt.

Best for
  • Ring Alarm households
  • Home Assistant and Hubitat users
  • Replacing older First Alert Z-Wave alarms
  • Wire-free installs

Pros

  • Smoke and carbon monoxide detection in one unit
  • Joins Ring Alarm, Home Assistant and Hubitat over Z-Wave
  • Fits the older First Alert Z-Wave mounting base
  • Sealed lithium battery rated for ten years, with a ten-year warranty
  • Precision Detection aims to reduce cooking nuisance alarms
  • Wire-free install, no mains wiring needed

Cons

  • Some owners report false alarms and units failing within a year or two
  • Sealed battery cannot be replaced, so the whole alarm is swapped at end of life
  • Pairing is fiddly: it must sit on its base and each hub wants different steps
  • Reported trouble joining SmartThings hubs, mainly older ones
  • Requires a Z-Wave hub, and no Alexa, Google Home, Apple Home or Matter
  • Priced above basic combination alarms

Who is the First Alert SMCO410 for?

It is aimed at homes that already run a Z-Wave controller and want smoke and CO alarms that report to it. Owners use it mainly with Ring Alarm, and also with Home Assistant, Hubitat and HomeSeer. It reuses the mounting bracket of the older First Alert Z-Wave alarm, so several owners swapped one in without remounting anything, and the sealed ten-year battery suits states that require it for battery-only alarms.

What do owners like about the First Alert SMCO410?

The praise is mostly about integration. Ring owners say it paired and worked with the base station, and Home Assistant and Hubitat owners say it joined their Z-Wave network on the first or second try. Installation is quick on the twist-lock base, and a few say it has fewer nuisance alarms near the kitchen than the previous generation.

What to know before you buy the First Alert SMCO410

Setup is the first trap: the alarm only wakes up and pairs once it is twisted onto its base, and different hubs want different steps (a factory reset, a Z-Wave exclusion first, or holding the test button until two beeps). The instructions are thin, so many owners looked them up. Reliability is the larger worry: a noticeable group report false alarms in the night, alarms that stopped reporting over Z-Wave, units that arrived faulty or chirping, and failures after a year or two. The 10-year battery is sealed, so a failing battery means replacing the whole alarm. SmartThings owners, especially on older hubs, report it failing to join or showing up as the wrong device type, and one Vivint owner says it does not send alarm triggers to the panel.

Is the First Alert SMCO410 worth it?

It is a reasonable choice if you already use Ring Alarm, Home Assistant or Hubitat and want a Z-Wave smoke and CO alarm with a ten-year life, but it is priced above plain alarms and owners are split on how long units last. Test each alarm soon after installing it, keep the packaging for returns, and look at another model if you run SmartThings or need to swap batteries yourself.

Frequently asked questions

How do I pair the First Alert SMCO410?

Mount the alarm on its base first, since it only wakes up once locked on. Then start inclusion on your hub and press and hold the test button until the alarm double beeps. Owners also advise a factory reset if the hub stops partway, and removing any older alarm from the Ring app first.

Does the SMCO410 work with Ring Alarm?

Yes, most owners with a Ring Alarm base station got it working. With Ring's Smoke and CO Listener it sends fire and carbon monoxide notifications while you are away, but a few owners saw it listed twice in the Ring app or had to reset it to pair.

Does the SMCO410 work with SmartThings?

It is a standard Z-Wave device and some owners got it working after excluding it first and using the double-beep inclusion, but several, especially on older SmartThings hubs, could not add it or found it listed as the wrong device type.

Can I replace the battery in the SMCO410?

No. It runs on a sealed lithium battery rated for ten years, after which the whole alarm is replaced. Owners dislike that they cannot pull the battery to silence a false alarm.

Does the SMCO410 give false alarms?

Some owners say it is quiet near the kitchen, while others report repeated night-time false alarms. Place it away from cooking and shower steam, and test it after installing.

Company
First Alert logo

First Alert

3.5/ 5 avg ratingUnited States flagHeadquartered in United States

First Alert is an American home safety brand owned by BRK Brands, specializing in smoke alarms, carbon monoxide detectors, fire extinguishers and combination smoke and CO alarms. Its smart lineup includes Wi-Fi connected smoke and CO alarms that send mobile alerts and work with Google Home, managed through the First Alert app. First Alert focuses on reliable, widely certified fire and CO safety products for the home.

Full specifications

Every spec, organized

Browse the full breakdown by category. Tap the on any row for what it means, or the for sources and documentation.

Dimensions

5 × 2.1 × 5 in 127 × 54 × 127 mm

Weight

9.9 oz 280 g

Wired

NO

Battery Type

Sealed lithium

Battery Life

10 years

2.4 GHz WiFi

NO

5 GHz WiFi

NO

Bluetooth

NO

Zigbee

NO

Z-Wave

YES

Thread Protocol

NO

Other

NO

Google Home

NO

Alexa

NO

Alexa's smart home API has no smoke or CO alarm type: the only supported route is the Matter Smoke CO Alarm device type, which this alarm does not speak

Apple HomeKit

NO

Samsung SmartThings

YES

Pairs with a SmartThings hub as a standard Z-Wave device

Home Assistant

YES

Matter

NO

Screen

NO

Screen Type

-

Smoke

YES

Precision Detection advanced sensing technology

CO

YES

Occupancy

NO

Temperature

NO

Humidity

NO

Air Quality

NO

Ambient Light

NO

Motion

NO

Fire Alerts

YES

Works with Ring Base Station for notifications while away (Ring Alarm with Smoke and CO Listener required)

CO Alerts

YES

Low Battery Alerts

YES

End-of-life warning

Temperature Alerts

NO

Air Quality Alerts

NO

Built-in Siren

YES

Built-in Light

NO

Tests Itself

NO

Pathlight

NO

Steam Check

YES

Precision Detection reduces cooking nuisance alarms

Automations

NO

Local Control

YES

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