Winner
Updated November 2026
Data from the official First Alert and Kidde sites.
2026 verdict
For a Z-Wave home, the First Alert SMCO410 Smoke Detector & CO Alarm is the better fit of these two, and it is the lower priced one.
It detects smoke and carbon monoxide, reports into a Z-Wave hub such as a Ring Alarm base station or Home Assistant, and ships with a sealed lithium battery rated for 10 years behind a 10-year warranty, so there is nothing to maintain. The Kidde Smart Smoke & CO Detector with Ring takes the other path: two AA batteries, 2.4 GHz Wi-Fi and free alerts in the Ring app with no hub required, plus a stronger owner sentiment and wireless interconnect. Pick the First Alert SMCO410 Smoke Detector & CO Alarm if you run Z-Wave or Home Assistant, and the Kidde Smart Smoke & CO Detector with Ring for a hubless Wi-Fi install in a Ring household.
Works with
Connectivity
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- Wi-Fi 2.4 GHz
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| Feature | First Alert SMCO410 Smoke Detector & CO Alarm | Kidde Smart Smoke & CO Detector with Ring | Winner |
|---|---|---|---|
| Price | $64.93 | $69.97 | First Alert SMCO410 Smoke Detector & CO Alarm |
| Rating | 3.5 | 4.3 | Kidde Smart Smoke & CO Detector with Ring |
| Connectivity | Z-Wave | 2.4 GHz WiFi, Other | Kidde Smart Smoke & CO Detector with Ring |
| Integrations | Samsung SmartThings, Home Assistant | Home Assistant | First Alert SMCO410 Smoke Detector & CO Alarm |
| Screen | NO | NO | Tie |
| Sensors | Smoke, CO | Smoke, CO | Tie |
| Alerts | Fire Alerts, CO Alerts, Low Battery Alerts | Fire Alerts, CO Alerts, Low Battery Alerts | Tie |
| Built-in Siren | YES | YES | Tie |
| Pathlight | NO | NO | Tie |
| Steam Check | YES | YES | Tie |
What the differences mean
Hub requirement
The First Alert SMCO410 Smoke Detector & CO Alarm uses Z-Wave and needs a hub such as a Ring Alarm base station or Home Assistant. The Kidde Smart Smoke & CO Detector with Ring uses 2.4 GHz Wi-Fi and works with the Ring app without a separate hub.
Power
The First Alert SMCO410 Smoke Detector & CO Alarm has a sealed lithium battery rated for 10 years, after which the whole unit is replaced. The Kidde Smart Smoke & CO Detector with Ring runs on replaceable AA batteries.
Interconnect
The Kidde Smart Smoke & CO Detector with Ring interconnects wirelessly so all Kidde alarms sound together. The First Alert SMCO410 Smoke Detector & CO Alarm coordinates through your Z-Wave hub and its automations instead.
Smart home paths
The First Alert SMCO410 Smoke Detector & CO Alarm reaches Ring Alarm, SmartThings and Home Assistant over Z-Wave. The Kidde Smart Smoke & CO Detector with Ring reaches the Ring app, with Home Assistant through a community integration. Neither supports Alexa, Google Home, Apple HomeKit or Matter.
Warranty
The First Alert SMCO410 Smoke Detector & CO Alarm carries a 10-year warranty. The Kidde Smart Smoke & CO Detector with Ring does not publish a warranty length.
Maintenance
The sealed battery of the First Alert SMCO410 Smoke Detector & CO Alarm means ten years with no battery changes, at the cost of discarding the whole alarm at end of life. The Kidde Smart Smoke & CO Detector with Ring asks for AA replacements along the way.
Which one to buy if
- you already run Z-Wave or Home Assistant
The First Alert SMCO410 Smoke Detector & CO Alarm joins the mesh and can trigger automations.
- you want a smoke and CO alarm with no hub and no wiring
The Kidde Smart Smoke & CO Detector with Ring runs on AA batteries and reports straight into the Ring app.
- you want ten years with no battery changes
Its sealed lithium battery and 10-year warranty remove maintenance entirely.
- you want whole-home interconnect in a Ring household
Multiple Kidde Smart Smoke & CO Detector with Ring units interconnect wirelessly so all sound together.
Winner
$64.93
- + Price: $64.93
- + Integrations: Samsung SmartThings, Home Assistant
- - Rating: 3.5 vs 4.3
- - Connectivity: Z-Wave vs 2.4 GHz WiFi, Other
$69.97
- + Rating: 4.3
- + Connectivity: 2.4 GHz WiFi, Other
- - Price: $69.97 vs $64.93
- - Integrations: Home Assistant vs Samsung SmartThings, Home Assistant
What owners say
Kidde Smart Smoke & CO Detector with Ring owners describe pairing as quicker than expected and value how cleanly it slots into an existing Ring Alarm setup, with smoke, CO and low-battery alerts arriving in the Ring app at no cost and no midnight chirping. Many are former Google Nest Protect owners who call it the smoothest replacement they found, and some run several units wired into whole-home coverage. The recurring notes are the missing night light, a price they still find high for a smoke alarm, and a rare unexplained false alarm; a few had a faulty first unit that Kidde replaced without fuss.
Frequently Asked Questions
Which is better overall: First Alert SMCO410 Smoke Detector & CO Alarm or Kidde Smart Smoke & CO Detector with Ring?
For a Z-Wave or Home Assistant home the First Alert SMCO410 Smoke Detector & CO Alarm, for its hub integration, sealed 10-year battery and 10-year warranty. For a Ring household without a hub, the Kidde Smart Smoke & CO Detector with Ring is simpler and more affordable.
What is the biggest difference between the First Alert SMCO410 Smoke Detector & CO Alarm and the Kidde Smart Smoke & CO Detector with Ring?
How they connect. The First Alert SMCO410 Smoke Detector & CO Alarm uses Z-Wave and needs a hub, while the Kidde Smart Smoke & CO Detector with Ring uses 2.4 GHz Wi-Fi and works with the Ring app on its own.
Can the First Alert SMCO410 Smoke Detector & CO Alarm and the Kidde Smart Smoke & CO Detector with Ring be interconnected with each other?
No. The First Alert SMCO410 Smoke Detector & CO Alarm interconnects through a Z-Wave hub, and the Kidde Smart Smoke & CO Detector with Ring interconnects wirelessly only with other Kidde alarms. They do not link to each other.
Does the First Alert SMCO410 Smoke Detector & CO Alarm need a hub?
For its smart features, yes. The First Alert SMCO410 Smoke Detector & CO Alarm uses Z-Wave, so a controller such as a Ring Alarm base station or Home Assistant is required. Without one it works as a conventional alarm.
Which has the longer warranty?
The First Alert SMCO410 Smoke Detector & CO Alarm, with a 10-year warranty. The Kidde Smart Smoke & CO Detector with Ring does not publish a warranty length.
Who should buy the Kidde Smart Smoke & CO Detector with Ring?
Ring Alarm households and anyone who wants a battery-powered, hubless smoke and CO alarm with free app alerts, low-level CO warnings and wireless interconnect, at a lower price.
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