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Combination Smoke Carbon Monoxide Detectors Comparison - April 2026
| 1 Best Choice  9.9Exceptional | 2  9.8Exceptional | 3  9.5Excellent | 4 Best Value  9.4Excellent | 5  9.3Excellent | 6  9.2Excellent | 7  9.1Excellent |
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ModelFirst Alert SMCO100 Battery-Operated Combination Smoke & Carbon Monoxide Alarm - 3 Pack | Model First Alert SMICO100-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with Battery Backup - 3 Pack | Model First Alert Combination Smoke & Carbon Monoxide Alarm, Interconnect Hardwire Detector with Battery Backup, SMICO100-AC, 1-Pack | Model First Alert Combination Smoke & Carbon Monoxide Alarm, Battery Operated Detector with Test & Silence Button, SMCO100, 1-Pack,White | Model Kidde Smoke & Carbon Monoxide Detector, AA Battery Powered, LED Warning Light Indicators, 2 Pack | Model 6 Packs, 2 in 1,Smoke Carbon Monoxide Detector,Carbon Monoxide Detectors/Smoke Alarm,85 dB Alarm,Large Screen Readout,Test Button,Battery Operated, Work State LED Flash,Easy Install | Model 2 Pack Smoke and Carbon Monoxide Detector,Smoke Detector Carbon Monoxide Detector Combo with Batteries,Fire Alarm Smoke Detector with Test Button and Digital Display |
BrandFirst Alert | Brand First Alert | Brand First Alert | Brand First Alert | Brand Kidde | Brand OLUNCLE | Brand LEMONTAIL |
Reviews | Reviews | Reviews  | Reviews | Reviews | Reviews | Reviews |
Tech Specs | ||||||
alarm Smoke, CO | alarm ‎Smoke, CO | alarm ‎Smoke, CO | alarm ‎Smoke, CO | alarm ‎Smoke and Carbon Monoxide Alarm | alarm ‎85dB | alarm Audible 85 dB |
item weight 1.55 pounds | item weight ‎1.68 pounds | item weight ‎9 ounces | item weight ‎8.2 ounces | item weight ‎12.8 ounces | item weight ‎1.38 pounds | item weight 0.74 Pounds |
power source Battery Powered | power source ‎Corded Electric | power source ‎Corded Electric | power source ‎Battery Powered | power source ‎Battery Powered | power source ‎Battery Powered | power source Battery Powered |
batteries included Yes | batteries included ‎Yes | batteries included ‎Yes | batteries included ‎Yes | batteries included ‎Yes | batteries included ‎Yes | batteries included - |
number of items 3 | number of items ‎3 | number of items ‎1 | number of items ‎1 | number of items ‎1 | number of items ‎6 | number of items - |
included components AA Batteries | included components ‎Easy Adapter Plug, 9V Battery | included components ‎Easy Adapter Plug, 9V Battery | included components ‎AA Batteries | included components ‎AA batteries, Mounting Hardware, Two Alarm, User Guide | included components ‎1 | included components - |
battery cell type Alkaline | battery cell type ‎Alkaline | battery cell type ‎Alkaline | battery cell type ‎Alkaline | battery cell type ‎Alkaline | battery cell type ‎Zinc Carbon | battery cell type - |
product dimensions 21.5 x 7.5 x 3.5 inches | product dimensions ‎21.5 x 7.5 x 3.5 inches | product dimensions ‎5.5"D x 2"W x 5.5"H | product dimensions ‎5.6"D x 5.6"W x 1.9"H | product dimensions ‎1.88"D x 5"W x 5"H | product dimensions ‎1.37"D x 4.21"W x 4.21"H | product dimensions - |
size 3-Pack | size ‎3-Pack | size ‎1-Pack | size ‎1-Pack | size ‎2 Pack | size ‎6-Pack | size - |
style Precision Detection | style ‎Precision Detection | style ‎Precision Detection | style ‎Precision Detection | style ‎Modern | style ‎Smoke Carbon Monoxide Detector, | style - |
sensor type Photoelectric | sensor type ‎Ionization | sensor type ‎Ionization | sensor type ‎Photoelectric | sensor type ‎Photoelectric, Electrochemical | sensor type - | sensor type Electrochemical, Photoelectric |
batteries required Yes | batteries required ‎Yes | batteries required ‎Yes | batteries required ‎Yes | batteries required ‎Yes | batteries required ‎Yes | batteries required - |
color White | color ‎White | color ‎White | color ‎White | color ‎White | color - | color - |
batteries 2 AA batteries required. included | batteries ‎1 9V batteries required. (included) | batteries ‎1 9V batteries required. (included) | batteries ‎2 AA batteries required. (included) | batteries - | batteries ‎3 AA batteries required. (included) | batteries - |
item package quantity 1 | item package quantity ‎1 | item package quantity ‎1 | item package quantity ‎1 | item package quantity ‎1 | item package quantity - | item package quantity - |
pattern SMCO100 | pattern ‎SMICO100-AC | pattern ‎SMICO100-AC | pattern ‎SMCO100 | pattern - | pattern - | pattern - |
Available On  | Available On | Available On | Available On  | Available On | Available On | Available On |
Our Top 3 Picks
Here are the top 3 recommended products with more information to help you find the right product for you
9.9
1First AlertFirst Alert SMCO100 Battery-Operated Combination Smoke & Carbon Monoxide Alarm - 3 Pack
Why we love it
Easy installation and maintenance.
Early warning for fires and carbon monoxide.
Reduces false alarms during cooking.
Main highlights- Test/silence button for efficient testing to ensure alarm is working properly
- Provides reliable 2-in-1 protection against both smoke and carbon monoxide
- First Alert's Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency
- End-of-life warning lets you know when it’s time to replace the alarm
- Battery-operated alarm allows for easy installation and maintenance
-
9.8
2First Alert
First Alert SMICO100-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with Battery Backup - 3 Pack
Why we love it
Reduces false alarms from cooking.
Easy installation with Quick Connect Plug.
Battery backup ensures continuous protection.
Main highlights- Through early warning interconnect, when one alarm sounds, all compatible alarms will sound
- Test/silence button for efficient testing to ensure alarm is working properly
- Quick Connect Plug allows for easy installation with no need to rewire
- First Alert's Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency
- Battery backup provides continuous protection during power outages
-
9.5
3First Alert12% Off
First Alert Combination Smoke & Carbon Monoxide Alarm, Interconnect Hardwire Detector with Battery Backup, SMICO100-AC, 1-Pack
Main highlights- Through early warning interconnect, when one alarm sounds, all compatible
- Test/silence button for efficient testing to ensure alarm is working properly
- Quick Connect Plug allows for easy installation with no need to rewire
- First Alerts Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency
- Battery backup provides continuous protection during power outages
Our ranking system
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Features
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Consumer Reviews
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Popularity
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Value for money
AI allows us to compare products based on attributes like price, specifications, and user feedback, helping to determine their value for money. This data-driven approach offers an efficient and reliable way to assess how products stack up against one another in terms of cost-effectiveness.
