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Combination Smoke Carbon Monoxide Detectors Comparison - August 2025
| 1 Best Choice  9.9Exceptional | 2 Best Value  9.8Exceptional | 3  9.7Exceptional | 4  9.6Exceptional | 5  9.4Excellent | 6  9.2Excellent | 7  9.1Excellent |
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ModelFirst Alert SMCO100 Battery-Operated Combination Smoke & Carbon Monoxide Alarm, 1-Pack | Model Kidde Smoke & Carbon Monoxide Detector, AA Battery Powered, LED Warning Light Indicators, 2 Pack | Model X-Sense 10-Year Battery Combination Smoke Carbon Monoxide Alarm Detector with Large LCD Display (Standalone Model) | Model 3 Pack Combination Smoke Carbon Monoxide Alarm Detector Battery Operated, Portable Smoke and Co Alarm for Home Bedroom Travel，Easy to Install | Model First Alert SMCO210, 10-Year Sealed Battery Combination Smoke & Carbon Monoxide Alarm with Slim Profile Design, 1-Pack | Model 3 Pack Combination Photoelectric Smoke Alarm and Carbon Monoxide Detector Battery Operated with Digital Display (White) | Model First Alert SMICO100, Battery-Operated Combination Smoke & Carbon Monoxide Alarm, 1-Pack |
BrandFIRST ALERT | Brand Kidde | Brand X-Sense | Brand ARIKON | Brand First Alert | Brand Linsoal | Brand First Alert |
Reviews | Reviews | Reviews | Reviews | Reviews  | Reviews | Reviews |
Tech Specs | ||||||
customer reviews4.6 4.6 out of 5 stars 30, 269 ratings 4.6 out of 5 stars | customer reviews 4.6 4.6 out of 5 stars 106 ratings 4.6 out of 5 stars | customer reviews 4.6 4.6 out of 5 stars 4, 675 ratings 4.6 out of 5 stars | customer reviews - | customer reviews 4.4 4.4 out of 5 stars 6, 495 ratings 4.4 out of 5 stars | customer reviews 4.8 4.8 out of 5 stars 27 ratings 4.8 out of 5 stars | customer reviews 5.0 5.0 out of 5 stars 20 ratings 5.0 out of 5 stars |
item weight 8.2 ounces | item weight 0.8 Pounds | item weight 10.6 ounces | item weight - | item weight 6.6 ounces | item weight 1.63 pounds | item weight 13.4 ounces |
power source Battery Powered | power source Battery Powered | power source Battery Powered | power source - | power source Battery Powered | power source Battery Powered | power source Battery Powered |
color White | color White | color White | color - | color White | color - | color White |
batteries included Yes | batteries included - | batteries included Yes | batteries included - | batteries included Yes | batteries included Yes | batteries included Yes |
alarm Smoke, CO | alarm Smoke and Carbon Monoxide Alarm | alarm Audible | alarm - | alarm Combination Alarm | alarm - | alarm Smoke and CO Alarm |
battery cell type Alkaline | battery cell type - | battery cell type Lithium Metal | battery cell type - | battery cell type Lithium | battery cell type Alkaline | battery cell type Alkaline |
product dimensions 3.21 x 6.75 x 8.5 inches | product dimensions - | product dimensions 2D x 5.7W x 5.7H | product dimensions - | product dimensions 5.67D x 5.67W x 1H | product dimensions 5 x 2 x 2 inches | product dimensions 5.6D x 5.6W x 2H |
size One | size - | size 1-Pack | size - | size One | size 3 pack | size 1-Pack |
sensor type Photoelectric | sensor type Photoelectric, Electrochemical | sensor type Photoelectric, Electrochemical | sensor type - | sensor type Photoelectric | sensor type - | sensor type Ionization |
batteries required Yes | batteries required - | batteries required Yes | batteries required - | batteries required Yes | batteries required Yes | batteries required Yes |
item package quantity 1 | item package quantity - | item package quantity 1 | item package quantity - | item package quantity 1 | item package quantity - | item package quantity 1 |
pattern 2nd Generation | pattern - | pattern Smoke Alarm | pattern - | pattern SMCO210 | pattern - | pattern - |
included components AA Batteries | included components - | included components detector, mounting bracket, screws, manual | included components - | included components - | included components Battery Powered | included components - |
warranty description 10 Years Limited | warranty description - | warranty description 60-day money-back guarantee, 5-year quality warranty, and lifetime technical support | warranty description - | warranty description Warranty | warranty description - | warranty description - |
batteries 2 AA batteries required. included | batteries - | batteries 2 Lithium Metal batteries required. included | batteries - | batteries 1 Product Specific batteries required. included | batteries - | batteries - |
style Standard Profile with Audible Alert | style - | style Standalone Model | style - | style Precision Detection | style - | style - |
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, 1-Pack
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
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9.8
2Kidde23% Off
Kidde Smoke & Carbon Monoxide Detector, AA Battery Powered, LED Warning Light Indicators, 2 Pack
Main highlights- TEST & HUSH BUTTON: Makes it easy to test the 5-inch combination detector and silence false alarms, should they occur.
- SELF-TESTING ALARM: Internal components ensure alarm is always operating as expected. Not a substitute for a manual push test, perform a button test once per week to verify alarm operation.
- NO WIRING NEEDED: Operates on 2-AA alkaline batteries (included) providing easy installation, simply mount the bracket onto the ceiling and twist & click the 5-inch smoke & CO alarm into the bracket.
- ENHANCED SENSING TECHNOLOGY: Reduces false smoke alarms often caused by cooking. Comprehensively tested to meet the latest UL standards, meets UL 217 9th Edition, UL 2034 4th Edition, & FCC standards.
- BATTERY REPLACEMENT: Batteries should be replaced every 6 months, a low battery chirp alerts you when batteries need replacing.
- 3 LED NOTIFICATIONS: LED lights indicate alarm status, green = normal operation, amber = operating error, red = smoke or carbon monoxide detected & a loud 85-decibel alarm will sound.
- 2-IN-1 DETECTION: Alerts you to both smoke & carbon monoxide (CO) using a single, cost-effective detector.
- 10-YEAR LIMITED WARRANTY: Warranty begins when the alarm is powered on. If that date is unknown, it should be assumed that alarms should be replaced.
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9.7
3X-Sense
X-Sense 10-Year Battery Combination Smoke Carbon Monoxide Alarm Detector with Large LCD Display (Standalone Model)
Why we love it
1. This smoke and carbon monoxide detector can save your life by detecting both smoke and carbon monoxide.
2. The battery lasts for 10 years, so you dont have to worry about changing batteries.
3. X Sense offers a 60 day money back guarantee, a 5 year warranty, and lifetime customer support.
Main highlights- Simple Installation: Requires no rewiring; easy to mount this smoke and carbon monoxide alarm on any wall or ceiling with the included mounting bracket, screws, and anchor plugs
- Please Note: SC07 is a basic standalone unit; it does not support wireless interconnection, does not have Wi-Fi, and cannot be used with a base station; for interconnection, search for SC07-W. For Wi-Fi functionality, look for SC07-WX or SC07-MR
- Informative LCD: Displays real-time CO levels from 30–999 ppm (parts per million) taken from the surrounding air, as well as battery level and working status
- Combination Alarm with CO Readings: When the alarm is triggered, the LCD will display the CO concentration and illuminate. In standby mode, the LCD turns off to ensure you are not disturbed
- 2-in-1 Protection: The combination smoke and CO detector detects both smoke and carbon monoxide faster and more accurately using a photoelectric smoke sensor and an electrochemical CO sensor
- 10-Year Battery: The fire and CO alarm is built with a sealed lithium battery that provides 10 years of continuous power, saving you from changing batteries and power outage
Our ranking system
At BestChoice.com, our team curates a selection of top products from a vast array available online, using a sophisticated ranking system based on carefully defined criteria.While traditional hands-on testing has its merits, our use of AI technology offers distinct advantages. AI allows us to process and analyze vast amounts of data from multiple sources, providing a comprehensive view that goes beyond what manual testing can achieve. This approach enables us to deliver insights that are aligned with current trends and consumer preferences, ensuring our reviews are both relevant and up-to-date.
Features
Our AI-driven analysis examines key attributes, capabilities, and other critical factors tailored to each product category. This method allows us to assess effectiveness from various perspectives, ensuring a well-rounded evaluation.
Consumer Reviews
We aggregate and evaluate consumer feedback from across the internet, giving weight to ratings and reviews that reflect the most reliable insights. AI enhances this process by filtering and prioritizing data, offering a balanced view without the need for direct personal endorsements.
Popularity
Our system also considers the popularity of products, analyzing factors such as market presence, reputation, and user satisfaction. By leveraging AI, we capture a comprehensive picture of a product's standing in the market, which may not always be evident through traditional testing.
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.
