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First Alert Smoke And Carbon Monoxide Detector Combination Alarms Comparison - April 2026
| 1 Best Choice  9.9Exceptional | 2  9.8Exceptional | 3 Best Value  9.7Exceptional | 4  9.4Excellent | 5  9.2Excellent | 6  9.1Excellent | 7  9.0Excellent |
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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 BRK SC9120B-3 Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup, White, Pack of 3 | Model First Alert Combination Smoke & Carbon Monoxide Alarm, Interconnect Hardwire Detector with Battery Backup, SMICO100-AC, 1-Pack | Model First Alert BRK SC-9120B Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup | Model First Alert Combination Smoke & Carbon Monoxide Alarm, Battery Operated Detector with Test & Silence Button, SMCO100, 1-Pack,White | Model First Alert SMICO110, 10-Year Battery Combination Smoke & Carbon Monoxide Alarm, 1-Pack |
BrandFirst Alert | Brand First Alert | Brand First Alert | Brand First Alert | Brand First Alert | Brand First Alert | Brand First Alert |
Reviews | Reviews | Reviews | Reviews  | Reviews | Reviews | Reviews |
Features | ||||||
Easy installation 9.4 | Easy installation 9.3 | Easy installation 9.6 | Easy installation 9.3 | Easy installation 9.6 | Easy installation 9.1 | Easy installation 7.2 |
Battery duration 9.1 | Battery duration 8.9 | Battery duration 9.1 | Battery duration 8.9 | Battery duration 9.4 | Battery duration 8.9 | Battery duration 8.6 |
Tech Specs | ||||||
color White | color ‎White | color White | color ‎White | color WHITE | color ‎White | color White |
batteries included Yes | batteries included ‎Yes | batteries included Yes | batteries included ‎Yes | batteries included No | batteries included ‎Yes | batteries included Yes |
alarm Smoke, CO | alarm ‎Smoke, CO | alarm Audible | alarm ‎Smoke, CO | alarm Audible | alarm ‎Smoke, CO | alarm Combination Alarm |
product dimensions 21.5 x 7.5 x 3.5 inches | product dimensions ‎21.5 x 7.5 x 3.5 inches | product dimensions 1.9D x 5.6W x 5.6H | product dimensions ‎5.5"D x 2"W x 5.5"H | product dimensions 2.25D x 5.59W x 5.69H | product dimensions ‎5.6"D x 5.6"W x 1.9"H | product dimensions 5.6D x 5.6W x 2H |
batteries 2 AA batteries required. included | batteries ‎1 9V batteries required. (included) | batteries 2 AA batteries required. included | batteries ‎1 9V batteries required. (included) | batteries 1 9V batteries required. | batteries ‎2 AA batteries required. (included) | batteries 1 Product Specific batteries required. included |
item weight 1.55 pounds | item weight ‎1.68 pounds | item weight 11.2 ounces | item weight ‎9 ounces | item weight 10.4 ounces | item weight ‎8.2 ounces | item weight 11.2 ounces |
item package quantity 1 | item package quantity ‎1 | item package quantity 1 | item package quantity ‎1 | item package quantity 1 | item package quantity ‎1 | item package quantity 1 |
power source Battery Powered | power source ‎Corded Electric | power source Battery Powered, Hardwired | power source ‎Corded Electric | power source Battery Powered | power source ‎Battery Powered | power source Battery Powered |
sensor type Photoelectric | sensor type ‎Ionization | sensor type electrochemical, ionization | sensor type ‎Ionization | sensor type Ionization | sensor type ‎Photoelectric | sensor type Ionization |
batteries required Yes | batteries required ‎Yes | batteries required Yes | batteries required ‎Yes | batteries required No | batteries required ‎Yes | batteries required Yes |
included components AA Batteries | included components ‎Easy Adapter Plug, 9V Battery | included components First Alert BRK SC-9120B Hardwired Combination Smoke and Carbon Monoxide Alarms with Battery Backup 3 , Mounting brackets 3 , 9-volt battery 3 | included components ‎Easy Adapter Plug, 9V Battery | included components First Alert SC9120B Combination Wire-In Single/Multiple Station Smoke and CO Detector 120V AC | included components ‎AA Batteries | included components - |
battery cell type Alkaline | battery cell type ‎Alkaline | battery cell type Alkaline | battery cell type ‎Alkaline | battery cell type - | battery cell type ‎Alkaline | battery cell type Lithium |
size 3-Pack | size ‎3-Pack | size 3-Pack | size ‎1-Pack | size 1 Pack | size ‎1-Pack | size - |
style Precision Detection | style ‎Precision Detection | style Hardwired | style ‎Precision Detection | style 10-year limited warranty | style ‎Precision Detection | style - |
pattern SMCO100 | pattern ‎SMICO100-AC | pattern Detector | pattern ‎SMICO100-AC | pattern - | pattern ‎SMCO100 | pattern - |
number of items 3 | number of items ‎3 | number of items - | number of items ‎1 | number of items - | number of items ‎1 | number of items - |
Review- | Review - | Review - | Review - | Review | Review - | Review - |
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
9.4 Easy installation9.1 Battery DurationWhy we love it
Easy installation and maintenance.
Early warning for fires and carbon monoxide.
Reduces false alarms during cooking.
-
9.8
2First Alert
First Alert SMICO100-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with Battery Backup - 3 Pack
9.3 Easy installation8.9 Battery DurationWhy we love it
Reduces false alarms from cooking.
Easy installation with Quick Connect Plug.
Battery backup ensures continuous protection.
-
9.7
3First Alert48% Off
FIRST ALERT BRK SC9120B-3 Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup, White, Pack of 3
9.6 Easy installation9.1 Battery DurationWhy we love it
Battery backup for constant monitoring.
Electrochemical ionization sensors.
Lights 85 dB siren for warning.
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.
