First Alert Battery Operated Combination Smoke Alarm

Last updated date: April 17, 2019

Review Melt Score

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We looked at the top 1 Smoke Detectors and dug through the reviews from 7 of the most popular review sites including New York Times Wirecutter, Consumer Reports, Consumer Search, Tuck, The Spruce, and more. Through this analysis, we've determined the best Smoke Detector you should buy.

Overall Take

In our analysis of 66 expert reviews, the First Alert First Alert Battery Operated Combo Smoke Alarm placed 2nd when we looked at the top 10 products in the category. For the full ranking, see below.

Editor's Note March 29, 2019:
Checkout The Best Smoke Detector for a detailed review of all the top smoke detectors.

Expert Summarized Score
7 expert reviews
User Summarized Score
462 user reviews
Our Favorite Video Reviews
What experts liked
That CO detector adds a good bit to the price—currently a single SCO501CN-3ST unit is just barely cheaper than the two-pack of our top pick—so we made this a separate recommendation in case you’re already covered with a stand-alone CO detector.
- New York Times Wirecutter
December 17, 2018 | Full review
It provides protection from smoky fires as well as dangerous CO, but is not as effective detecting blazing fires.
- Consumer Search
March 21, 2018 | Full review
The Voice Alarm is its standout feature. You can program up to 11 locations within your home, and the alarm will verbally alert you precisely where the danger is.
- Tuck
August 30, 2018 | Full review
Consumer Reports recommends this model because it did an excellent job of detecting high and low CO levels in its tests, and the device clearly conveys unsafe environments.
- Business Insider
October 29, 2018 | Full review
Owners say these units are easy to set up without expert help, and they especially like them for protecting larger homes.
- The Spruce
March 1, 2019 | Full review
One unique feature of the SCO501CN-3ST is that in addition to a loud 85-decibel siren is a voice alarm with 11 programmable locations indicate where and what the threat is.
February 18, 2019 | Full review
What experts didn't like
Not as effective detecting blazing fires.
- Consumer Search
March 21, 2018 | Full review
There are some complaints of false alarms, even when there are no clear causes.
- Business Insider
October 29, 2018 | Full review
Some reviewers say they have had issues with false alarms or the units not linking properly, however.
- The Spruce
March 1, 2019 | Full review

From The Manufacturer

The First Alert SCO501CN-3ST Combination Smoke and Carbon Monoxide Alarm with Voice Location detects both smoke and carbon monoxide in a single device. The alarm interconnects with up to 18 other First Alert enabled alarms in your home to create a wireless safety network. The photoelectric smoke sensor is designed to reduce false alarms from cooking smoke or shower steam while remaining sensitive to real danger. The advanced electrochemical CO sensor detects carbon monoxide leaks from multiple sources, including faulty fuel-burning appliances. A loud 85-decibel siren and a voice alarm with 11 programmable locations indicate where and what the threat is.

Overall Product Rankings

1. Nest Protect Smoke and Carbon Monoxide Alarm
Overall Score: 9.4
Expert Reviews: 9
3. Kidde Hardwire Smoke Alarm
Overall Score: 9.0
Expert Reviews: 9
4. Alert Pro 10 Year Battery Smoke Detector Fire Alarm
Overall Score: 8.9
Expert Reviews: 1
5. First Alert Interconnected Wireless Smoke Alarm
Overall Score: 8.4
Expert Reviews: 7
6. First Alert Dual-Sensor Smoke and Fire Alarm
Overall Score: 8.3
Expert Reviews: 7
8. Leeo Smart Alert Smoke/CO Remote Alarm Monitor
Overall Score: 7.8
Expert Reviews: 8
9. First Alert Smoke Alarm With Photoelectric Sensor
Overall Score: 7.4
Expert Reviews: 4
10. First Alert P1000
Overall Score: 6.5
Expert Reviews: 1

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