The Best First Alert Carbon Monoxide Detectors 2025

1. First Alert Smoke And Carbon Monoxide Alarm, 2 Aa Batteries

Basic Battery Operated Photoelectric Smoke/Co Combo Alarm Meets Most State And Local Codes For Carbon Monoxide And Combination Alarms. Easy Alarm Identification Through Different Horn Sounds And Lights Single Button Test/Silence Photoelectric Smoke And Electrochemical Co Sensors 2Aa Batteries - Save 33% On Annual Battery Replacement Costs Vs. Other Smoke/Co Combo Alarm Brands That Use 3Aa Batteries End Of Life Signal Provides Audible Notification Alarms Needs To Be Replaced 7-Years Limited Warranty

First Alert Smoke And Carbon Monoxide Alarm, 2 Aa Batteries

2. First Alert CO5120BN White Digital Display Hardwired Battery, Electrochemical Carbon Monoxide Alarm

Get alerted to dangerous carbon monoxide leaks with the First Alert CO5120BN Hardwired Carbon Monoxide Alarm with Battery Backup. This carbon monoxide detector uses an advanced electrochemical carbon monoxide sensor that accurately detects elevated CO levels and comes equipped with a microprocessor that helps minimize false alarms. The alarm's plug-in power connector makes installation quick and easy, while its tamper-resistant mounting bracket lock keeps the alarm secure. Featuring a 9-volt battery backup, this unit is designed to offer seamless detection, even in the event of a power outage. An 85-decibel horn sounds if carbon monoxide levels are too high, and a warning chirp notifies you when the battery needs to be replaced. This carbon monoxide alarm can integrate with up to 12 other First Alert or BRK hardwired alarms and up to six other compatible devices--such as bells, horns, and repeaters--making it ideal for comprehensive coverage of large households or facilities. A latching alarm indicator automatically identifies which unit in the series triggered the alarm. And thanks to the convenient test/silence button, the alarm can be checked easily to ensure it is functioning properly and false alarms can be muted easily.

First Alert CO5120BN White Digital Display Hardwired Battery, Electrochemical Carbon Monoxide Alarm 120-volt hardwired carbon monoxide alarm connects directly to your home's electrical system Electrochemical sensor accurately detects carbon monoxide levels Microprocessor-controlled design minimizes false alarms Easy-to-access battery drawer with a 9-volt battery included Integrates with up to 18 compatible devices for extended coverage Features a tamper-resistant mounting bracket for secure installation

3. First Alert SCO500B Wireless Interconnected Photoelectric Smoke and Carbon Monoxide Combo Alarm with Voice and Location

The First Alert SCO500B Wireless Interconnected Photoelectric Smoke and Carbon Monoxide Combo Alarm with Voice and Location detects smoke and elevated carbon monoxide levels and can work with compatible models to create a wireless alert system throughout your home (additional alarms sold separately). For those who want a comprehensive detection system without hiring an electrician or worrying about hardwiring, this battery-operated CO smoke detector combo is an ideal solution. Wireless technology connects the detector with other compatible First Alert wireless-enabled alarms in your home to create a wireless safety network. Up to 16 compatible alarms can communicate with each other and alert you when there is a problem across the house--even in a different room or on a different floor. 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 is designed to wake event he soundest sleepers, and a voice alarm indicates where and what the threat is.

Battery-operated carbon monoxide smoke alarm can be installed easily Multiple alarms can be connected to create a wireless safety network (additional alarms sold separately) Voice alarm gives clear indication of where the problem is located Photoelectric smoke sensor and electrochemical CO sensor One button silences a false alarm and tests the unit

4. First Alert 7010B White Hardwired Smoke Combination Alarm Battery Backup

The First Alert Hardwired Combination Smoke and Carbon Monoxide Alarm detects both carbon monoxide and smoke in a single device. It is designed for hardwired installation but features a 10-year battery backup that allows the unit to function in the event of a power outage. The CO smoke detector can be connected to other compatible BRK or First Alert CO smoke detectors within a single-family residence. A single button silences or tests the unit.

First Alert 7010B White Hardwired Smoke Combination Alarm Battery Backup Hardwired smoke and carbon monoxide alarm with 10-year battery backup for constant monitoring Electrochemical carbon monoxide sensing technology and intelligent smoke sensing technology to minimize nuisance alarms Indicator lights display presence of smoke or carbon monoxide; 85-decibel siren provides loud warning upon detection Easy to use with a single test/silence button; includes a locked drawer for the 10-year lithium battery to prevent tampering Adapter plugs included for hassle-free installation without rewiring

5. Basic CO Alarm w/ 9V Battery

The First Alert CO400 Carbon Monoxide Alarm utilizes a electrochemical carbon monoxide sensor that lasts for up to 5 years to detect carbon monoxide. This carbon monoxide detector is battery powered, making it portable and easy to use anywhere. When carbon monoxide levels become elevated, a loud 85dB alarm alerts you to the threat.

• Model number C0400 • Alerts to dangerous carbon monoxide levels • Most accurate electrochemical carbon monoxide sensor technology • Battery-operated design works almost anywhere • Loud 85dB alarm sounds when carbon monoxide levels are elevated • Single test/silence button for simple operation • 5-year limited warranty • Includes 9V battery

6. First Alert Carbon Monoxide Alarm, 9V Battery Operated, Electrochemical Sensor,Carbon Monoxide Alarm

Basic 9V Battery Operated Carbon Monoxide Alarm Meets Most Codes, Both State And Local, For Carbon Monoxide Alarms. Electrochemical Carbon Monoxide Sensor - The Most Accurate Sensor Available As Compared To Other Sensing Technologies End Of Life Signal Provides Audible Notification Alarms Needs To Be Replaced Single Button Test/Silence Two Silence Features - Can Silence The Low-Battery Chirp For Up To Eight Hours Or Temporarily Silence An Unwanted Nuisance Alarm 7-Years Limited Warranty

First Alert Carbon Monoxide Alarm, 9V Battery Operated, Electrochemical Sensor,Carbon Monoxide Alarm Operates on 2 AA batteries for reliable power Meets most state and local codes for carbon monoxide alarms Features an electrochemical carbon monoxide sensor for accurate detection End of life signal provides audible notification when replacement is needed Single button test/silence for easy operation Two silence features to manage low-battery chirp and nuisance alarms

7. Plug-In CO Alarm w Digital Display

The First Alert CO615 Dual-Power Carbon Monoxide Plug-in Alarm alerts you to dangerous carbon monoxide levels. This carbon monoxide detector operates on a dual-power system with battery backup for continuous monitoring, even in the event of a power outage. The backlit digital screen tells you, at a glance, what the carbon monoxide and power levels are. The monitor also features a convenient test and silence button and an end-of-life timer that lets you know when it is time to replace the unit.

• Model number CO615 • Dual-power carbon monoxide alarm offers continuous monitoring of carbon monoxide levels • Plugs into any outlet & features battery backup • Backlit digital display shows readings for power & carbon monoxide • Single test/silence button for simple operation • End-of-life timer signals when the detector needs replacing • 7-year limited warranty • Includes 2 AA batteries

8. First Alert Plug-in Electrochemical Explosive Gas and Carbon Monoxide Detector

This 3-in-1 gas alarm warns against natural/methane, propane and carbon monoxide. The digital display makes for easy reading during an alarm or when, any button is pressed. The alarm plugs into any standard outlet with no additional mounting necessary and comes with a line cord, which offers multiple placement options. The alarm also comes with a battery backup in the case of a power outage and utilizes an electrochemical carbon monoxide sensor for increased accuracy. Meets UL standards.

Versatile CO alarm senses high levels of propane, natural/methane gas, and carbon monoxide. Crisp backlit digital display allows you to view current and peak levels. Can be remotely muted using almost any household remote control. Plugs into any AC outlet for easy setup; backup battery powers unit in case of power outage. Loud 85-decibel alarm can be heard easily.

9. First Alert sco7cn, White, Battery, Dual Sensor Carbon Monoxide & Smoke Combination Alarm

First Alert SCO7CN Combination Smoke and Carbon Monoxide Detector with Voice and Location, Battery Operated

First Alert sco7cn, White, Battery, Dual Sensor Carbon Monoxide & Smoke Combination Alarm Detector with Voice and Location, Battery Operated Detects both smoke and carbon monoxide for comprehensive safety Features voice alerts that announce the type and location of danger Battery operated for easy installation without the need for wiring Compact design allows for versatile placement in any room Equipped with a test/silence button for convenient operation Ideal for homes, apartments, and other living spaces

10. Rhodes Race Cars 18-0220-SU 20 Gallon Pro Series Fuel Cell 0-90 Ohm Sending Unit

20 Gallon Pro Series Fuel Cell 0-90 Ohm Sending Unit 5051 Aluminum Natural Finish -8, -10 & -12 AN Fittings 24 in. Length 20 in. Width 10 in. Height 2 in. Sump Fitting Sizes -12 AN and -10 AN Outlet Fitting Sizes -8 AN Return Fitting Size -10 AN Vent Fitting Size

0-90 Ohm Sending Unit 5051 Aluminum Natural Finish -8, -10 & -12 AN Fittings 24 in. Length