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Smoke & CO Detectors · Head to head

First Alert SC5 Hardwire Smart Smoke & CO Alarm vs X-Sense WiFi Smoke & CO Detector

Full Smart Smoke & CO Detectors comparison in 2026

Data from Amazon and official First Alert and X-Sense sites.
2026 verdict
Hardwired or battery, it comes down to ecosystem and warranty: the First Alert SC5 Hardwire Smart Smoke & CO Alarm takes this smoke and CO alarm comparison with a 10-year warranty against 5 years, Google Home integration and steam check.
First Alert SC5 Hardwire Smart Smoke & CO Alarm
Winner
First Alert SC5 Hardwire Smart Smoke & CO Alarm

Last recorded price

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The X-Sense WiFi Smoke & CO Detector counters with an LCD screen, a built-in light, stronger owner feedback and documented Home Assistant support. They share the essentials: smoke and carbon monoxide sensing, a built-in siren, low-battery alerts and 2.4 GHz Wi-Fi. Installation is the practical split, since the SC5 Hardwire runs on mains power with a 3V lithium backup while the X-Sense is battery powered on CR123A. Buy the SC5 Hardwire to replace a wired alarm in a Google Home; buy the X-Sense for a battery unit with a display.
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FeatureFirst Alert SC5 Hardwire Smart Smoke & CO AlarmX-Sense WiFi Smoke & CO DetectorWinner
Rating3.24.5X-Sense WiFi Smoke & CO Detector
Warranty10 years5 yearsFirst Alert SC5 Hardwire Smart Smoke & CO Alarm
IntegrationsGoogle HomeHome AssistantFirst Alert SC5 Hardwire Smart Smoke & CO Alarm
ScreenNOYESX-Sense WiFi Smoke & CO Detector
Built-in LightNOYESX-Sense WiFi Smoke & CO Detector
Steam CheckYESNOFirst Alert SC5 Hardwire Smart Smoke & CO Alarm
Connectivity2.4 GHz WiFi2.4 GHz WiFiTie
SensorsSmoke, COSmoke, COTie
AlertsFire Alerts, CO Alerts, Low Battery AlertsFire Alerts, CO Alerts, Low Battery AlertsTie
Built-in SirenYESYESTie
Tests ItselfNONOTie
PathlightNONOTie

Price history compared

Every price change of both, in the same store, so the gap between the two lines is what one costs more than the other.

  • First Alert SC5 Hardwire Smart Smoke & CO Alarm
  • X-Sense WiFi Smoke & CO Detector

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Frequently Asked Questions

Which is better overall: First Alert SC5 Hardwire Smart Smoke & CO Alarm or X-Sense WiFi Smoke & CO Detector?

The First Alert SC5 Hardwire Smart Smoke & CO Alarm wins on warranty, Google Home integration and steam check. The X-Sense WiFi Smoke & CO Detector wins on its screen, light and owner feedback.

What is the biggest difference between the First Alert SC5 Hardwire Smart Smoke & CO Alarm and the X-Sense WiFi Smoke & CO Detector?

Power. The First Alert SC5 Hardwire Smart Smoke & CO Alarm is wired with a 3V lithium backup battery, while the X-Sense WiFi Smoke & CO Detector runs on a CR123A battery.

Which one has a screen?

Only the X-Sense WiFi Smoke & CO Detector has one, an LCD. The First Alert SC5 Hardwire Smart Smoke & CO Alarm has no screen.

Which smart home platforms do they work with?

The First Alert SC5 Hardwire Smart Smoke & CO Alarm works with Google Home. The X-Sense WiFi Smoke & CO Detector works with Home Assistant. Neither supports Alexa, Apple Home, SmartThings or Matter.

Who should buy the First Alert SC5 Hardwire Smart Smoke & CO Alarm?

The First Alert SC5 Hardwire Smart Smoke & CO Alarm fits homes with existing wired alarm locations, Google Home and a preference for a 10-year warranty.

Who should buy the X-Sense WiFi Smoke & CO Detector?

The X-Sense WiFi Smoke & CO Detector fits buyers who want a battery alarm with an LCD readout, a built-in light and Home Assistant.

Full comparison table

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