Head-to-head · Best Carbon Monoxide Detectors

First Alert CO710 Carbon Monoxide Alarm vs First Alert SC5 Smart Smoke and Carbon Monoxide Alarm

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

The short answer

First Alert CO710 Carbon Monoxide Alarm comes out ahead by a clear margin (4.5 vs 4.1). The gap is mostly about Travelers and low-maintenance users — read the strengths below before deciding.

Higher ratedRanked #1 in Best Carbon Monoxide Detectors

First Alert CO710 Carbon Monoxide Alarm

4.5

$46

The First Alert CO710 Carbon Monoxide Alarm features a 10-year sealed battery that eliminates the need for battery replacements, according to reviewers. Users praise its digital display and ease of installation. Consumer Reports recommends it as a reliable option for home safety. Some users note that testing requires firm pressing, and there's debate about optimal placement. This alarm is ideal for those seeking a low-maintenance, long-lasting CO detector.

Strengths

— 10-year sealed battery eliminates need for battery replacement
— Digital display shows carbon monoxide levels clearly
— Easy to install and portable for travel use

Watch-outs

— Requires firm pressing to test function
— Some users report conflicting information about optimal placement

$46 · Check Price on Amazon Full review →

Ranked #4 in Best Carbon Monoxide Detectors

First Alert SC5 Smart Smoke and Carbon Monoxide Alarm

4.1

$111

The First Alert SC5 Smart Smoke and Carbon Monoxide Alarm offers a modern design and app-based control that enhances home safety. Bob Vila reviewers praised its simple installation, one-button silence feature, and Google Home integration. Isaac from Smart Home Explained noted the device's superior build quality and smooth app setup process. However, the $130 price point and limited brand compatibility for interconnect features are drawbacks. This alarm suits users seeking smart home integration and improved user experience over traditional detectors, but those with existing non-First Alert systems may miss out on full network coverage.

Strengths

— Easy installation with pre-installed batteries and voice-guided setup
— One-button silence feature improves user experience during false alarms
— Integrates seamlessly with Google Home smart home ecosystem

Watch-outs

— Price is significantly higher than standard alarms at around $130 per unit
— Limited interconnect compatibility with other brands like Kidde and Nest Protect

$111 · Check Price on Amazon Full review →

How they stack up

First Alert CO710 Carbon Monoxide Alarm

The CO710 excels with its 10-year sealed battery, unlike the Klein ET110 which requires periodic calibration and the SC5 which needs regular battery replacements. While the SC5 offers smart features and the basic First Alert detector provides dual protection, the CO710 stands out for its portability and travel-friendly design, making it ideal for temporary living situations.

First Alert SC5 Smart Smoke and Carbon Monoxide Alarm

The SC5 Smart Alarm outperforms the CO710 in smart home integration with Google Home compatibility and app-based testing, while the CO710 lacks smart connectivity. Compared to the basic First Alert detector, the SC5 offers superior user experience with one-button silence and voice alerts, though it comes at a significantly higher price point.

Specs side-by-side

Spec	First Alert CO710 Carbon Monoxide Alarm	First Alert SC5 Smart Smoke and Carbon Monoxide Alarm
Detection Type	Electrochemical sensor	Smart Smoke and CO Alarm
Power Source	Battery operated	Built-in lithium backup battery
Battery Life	10 years	10-year sealed lithium battery
Display	Digital	LED light ring
Alarm Thresholds	85 dB	70 PPM CO concentration
Features	Carbon monoxide detection	App-based testing, voice alerts, one-button silence
Connectivity	—	Google Home compatible

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