First Alert SMCO410 Smoke Detector & CO Alarm vs Shelly Plus Smoke Alarm comparison

Data from Amazon and official First Alert and Shelly sites.

2026 verdict

First Alert SMCO410 Smoke Detector & CO Alarm edges out Shelly Plus Smoke Alarm in 2026, led by warranty, battery life, and sensors. It has the clearer edge on warranty, battery life, and sensors, and it stays ahead on alerts and steam check. There is still a case for Shelly Plus Smoke Alarm, but mainly if price, rating, and connectivity is what you value most. That is why First Alert SMCO410 Smoke Detector & CO Alarm wins the verdict here.

Winner

First Alert SMCO410 Smoke Detector & CO Alarm

7% OFF

$60.48

$64.97

25% OFF

€39.95

€53.43

Feature	First Alert SMCO410 Smoke Detector & CO Alarm	Shelly Plus Smoke Alarm	Winner
Price	$60.48	€39.95	Shelly Plus Smoke Alarm
Rating	3.4	4.3	Shelly Plus Smoke Alarm
Warranty	10 years	3 years	First Alert SMCO410 Smoke Detector & CO Alarm
Battery Life	10 years	5 years	First Alert SMCO410 Smoke Detector & CO Alarm
Connectivity	Z-Wave	2.4 GHz WiFi, Bluetooth	Shelly Plus Smoke Alarm
Integrations	None	Google Home, Alexa, Samsung SmartThings, Home Assistant	Shelly Plus Smoke 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	Shelly Plus Smoke Alarm
Steam Check	YES	NO	First Alert SMCO410 Smoke Detector & CO Alarm
Screen	NO	NO	Tie
Built-in Siren	YES	YES	Tie

Winner

7% OFF

$60.48

$64.97

25% OFF

€39.95

€53.43

Which is better overall: First Alert SMCO410 Smoke Detector & CO Alarm or Shelly Plus Smoke Alarm?

First Alert SMCO410 Smoke Detector & CO Alarm has the stronger overall profile in this comparison, especially for warranty, battery life, and sensors.

What is the biggest difference between First Alert SMCO410 Smoke Detector & CO Alarm and Shelly Plus Smoke Alarm?

Price is one of the clearest differences: First Alert SMCO410 Smoke Detector & CO Alarm lists $60.48, while Shelly Plus Smoke Alarm lists €39.95.

Which one looks better on price?

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

Choose First Alert SMCO410 Smoke Detector & CO Alarm if your priority is warranty and battery life and that matters more than price.

Who should buy Shelly Plus Smoke Alarm?

Choose Shelly Plus Smoke Alarm if your priority is price and rating and that matters more than warranty.

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