Best Monoxide Alarm In July 2025

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Here, we’ll review the top 10 Best Monoxide Alarm on the market today. We’ll provide an overview of the pros and cons of each product. Read on for our selection of Best Monoxide Alarm.

To help you in your search, we have completed this list of the Best Monoxide Alarm.

Top Rated Best Monoxide Alarm Of 2025

Rank	Product Name	Score
1	Kidde AC Plug-in Carbon Monoxide and Explosive Gas Detector Alarm | Nighthawk Sensor Buy Now	9.7 Buy Now
2	Kidde 21026043 Battery-Operated(Not Hardwired) Combination Smoke/Carbon Monoxide Alarm with Voice Warning KN-COSM-BA Buy Now	9.5 Buy Now
3	Kidde KN-Copp-B-LPM Monoxide Alarm, KN-Copp-B-LPM Buy Now	9.1 Buy Now
4	Kidde 00760 - 120 volt Digital Display Plug-In Carbon Monoxide Alarm with Battery Buy Now	8.8 Buy Now
5	Kidde 21026065 Smoke & Carbon Monoxide Alarm with Voice Warning Buy Now	8.6 Buy Now
6	Kidde 25759 - 120 volt Plug-In Carbon Monoxide Alarm with Battery Backup Buy Now	8.3 Buy Now
7	First Alert Smoke Detector and Carbon Monoxide Detector Alarm | Battery Operated, SCO5CN Buy Now	8.1 Buy Now
8	Kidde Carbon Monoxide Detector Alarm |Battery Operated | Model # KN-COB-LP2 9CO5-LP2 Buy Now	7.8 Buy Now
9	Kidde 21007267 Nighthawk Carbon Monoxide Alarm, Battery Operated with Digital Display | Model Buy Now	7.5 Buy Now
10	Kidde 00120 - 120 volt Carbon Monoxide Alarm with Battery Backup Buy Now	7.2 Buy Now

1. Kidde AC Plug-in Carbon Monoxide and Explosive Gas Detector Alarm | Nighthawk Sensor

• Two alarms in one detects carbon monoxide and explosive gas
• Peak level memory - recalls the highest co concentration detected
• Protects you and your family from two deadly threats: carbon monoxide and explosive gas.
• Kiddes carbon monoxide alarms meet the requirements of underwriters laboratories (ul), an independent facility that tests products for compliance with widely-accepted safety standards
• Digital display and peak level button displays the peak co level recorded by the alarm since it was last reset
• Sounder alarm the kn-coeg-3 offers a loud 85-decibel pulsing alarm that will sound to alert you to a potential problem.

2. Kidde 21026043 Battery-Operated(Not Hardwired) Combination Smoke/Carbon Monoxide Alarm with Voice

• Audio alarm: 85 db at 10 feet. test/reset button and leds tests alarm circuitry and triggers the voice announcement. flashing green for normal operation and flashing red for alarm condition. humidity range: 10 percent to 95 percent relative humidity non-condensing
• Voice alarm announces the hazard type detected thereby helping to speed up the correct reaction to the hazard detected. alarm announces fire! when a smoke or fire hazard is detected and announces warning carbon monoxide when a co hazard is detected
• Voice announcements - hush feature temporarily silences nuisance alarms with hush mode activated and hush mode cancelled voice announcement. if the alarm had detected a co level of 100ppm or higher, the unit will announce carbon monoxide previously detected to warn of the co incident, when the test/ reset button is pressed.temperature range:40f (4.4c) to 100f ...
• Combined carbon monoxide and smoke alarm a single unit can be installed where previously, two were needed. reduces installation time and helps to keep home dcor attractive.
• Battery - provides protection even during power outages when many fire and carbon monoxide incidents occur. the unit warns of a low battery condition by announcing low battery and by initiating an alarm chirp and activating a flashing red led. the battery door will not close unless the batteries are properly installed. note : the date printed on the item is manufact...

3. Kidde KN-Copp-B-LPM Monoxide Alarm, KN-Copp-B-LPM

• Led's - green led for normal operation, red led for alarm. temperature range 40f (4.4c) to 100f (37.8c).sensor: electrochemical
• Test/reset button - tests units electronic circuitry & horn and resets the unit during alarm. tests co alarm circuit operation and allows you to immediately silence the alarm
• Battery operated - provides best protection during power outages. battery safeguard makes it difficult to close the cover without batteries in the unit. low battery signal alerts user when the batteries need to be replaced. slide-out battery door cover gives immediate access to batteries
• Digital display - displays the level of carbon monoxide the unit is sensing. shows co level in ppm (parts per million). updates digital reading every 15 seconds allowing you to see if levels change. peak level memory displays the highest co concentration measured since the last reset
• Provides peace of mind against the silent killer and a digital display

4. Kidde 00760 - 120 volt Digital Display Plug-In Carbon Monoxide Alarm with Battery

• Note: this co alarm is not battery operated. however, these alarms are equipped with 9 volt battery backup the 9 volt battery is to supply short term back-up during a power outage.
• Test button functions tests the unit for proper operation and resets the carbon monoxide alarm
• Ten years after the initial power up, this alarm will beep two times every 30 seconds to indicate that it is time to replace the alarm.
• Power source: 120vac. temperature range-40f (4.4c) to 100f (37.8c). humidity range-5%-95% relative humidity (rh)
• Peak level button displays the peak co level recorded by the alarm since it was last reset or unplugged
• Led operation blinking dot in lower right corner of display denotes normal operation

5. Kidde 21026065 Smoke & Carbon Monoxide Alarm with Voice Warning

• Sealed-in lithium battery sealed-in lithium power supply, no battery replacement required over the 10 year life of the alarm. eliminates worry about battery removal or unauthorized deactivation of alarm.
• Combination smoke and carbon monoxide alarm smoke and co sensing technologies work together to detect real fires faster and reduce nuisance alarms.
• Self activation alarm automatically activates when attached to the mounting bracket.
• Voice alarm announces the hazard type detected thereby helping to speed up the correct reaction. alarm announces fire! when a smoke or fire hazard is detected and announces warning carbon monoxide when a co hazard is detected.
• Photoelectric sensor smoke alarm contains advanced photoelectric sensor that may detect visible particles (associated with smoldering fires) sooner than ionization alarms.

6. Kidde 25759 - 120 volt Plug-In Carbon Monoxide Alarm with Battery Backup

• Two leds : red - illuminates when in alarm mode. green ac power is present, normal operation
• Test/reset button : tests co alarm circuit operation and allows you to immediately silence the alarm
• Provides peace of mind against the silent killer, temperature range: 40f (4.4c) to 100f (37.8c)
• Tamper resist feature can be activated to cause unit to go into alarm if it has been unplugged or has come loose from the outlet
• End of life alarm : alerts user to replace co alarm after 10-years of operation

7. First Alert Smoke Detector and Carbon Monoxide Detector Alarm | Battery Operated, SCO5CN

• Indicator lights on the face of the unit display the presence of smoke or carbon monoxide, while an 85 decibel siren provides a clear, loud warning upon detection
• 7 year limited warranty, equipped with end of life signal chirp, so you know when its time to replace the unit for safety, all first alert alarms are rigorously tested to meet ul standards
• Keep your family safe with this battery operated smoke and carbon monoxide alarm, battery powered alarms provide continuous monitoring of co levels, even if there's a power failure
• Features an electrochemical carbon monoxide sensing technology as well as a photoelectric sensor that detects the larger particles of a smoldering fire
• Battery operated unit installs quickly and easily without an electrician. low battery signal mute, quiets low battery signal for upto 8 hours
• First alert has been the most trusted brand in home safety since launching the first residential smoke alarm in 1958 (based on a first alert brand trust survey in february 2018)

8. Kidde Carbon Monoxide Detector Alarm |Battery Operated | Model # KN-COB-LP2 9CO5-LP2

• Event memory
• Low battery signal
• 2 aa battery backup
• Loud 85 decibel alarm
• Low battery hush

9. Kidde 21007267 Nighthawk Carbon Monoxide Alarm, Battery Operated with Digital Display | Model

• Battery lockout system deters covering battery compartment without installation of batteries
• Backlit display to help see the co level reading in the dark
• Peak level memory displays the highest co concentration measured since the last reset
• Battery operated (3 aas included) to provide protection during power outages
• Digital display shows co level in ppm (parts per million) and updates digital reading every 15 seconds

10. Kidde 00120 - 120 volt Carbon Monoxide Alarm with Battery Backup

• Battery pull tab eliminates battery installation time and keeps battery fresh.
• Important: this carbon monoxide alarm is designed to detect carbon monoxide from any source of combustion. it is not designed to detect smoke, fire, or any other gas
• Quick connect installs quickly with snap-on harness.
• Sealed cover reduces nuisance alarms. sealed to protect sensor from contaminants prior to installation.
• Alkaline battery backup for continuous protection in case of power failure. temperature range-40f (4c) to 100f (38c)
• Test/reset - tests co alarm circuit operation and allows you to immediately silence the alarm.