Verdict overview
- Easy installation 9.8
- lasts a long time 9.3
- Simple to use 9.6
- Precision 9.3
- Battery Duration 9.3
- clearly written 9.6
Pros
Easy plug-in with battery backup.
Accurate CO detection anywhere in room.
Simple test/silence button operation.
Cons
Battery quality uncertain.
Tech specs
color | White |
pattern | Alarm |
batteries included | Yes |
warranty description | 7 Years Limited |
alarm | Carbon Monoxide |
customer reviews | 4.7 4.7 out of 5 stars 18,035 ratings 4.7 out of 5 stars |
battery cell type | Alkaline |
product dimensions | 1.38D x 5W x 3.4H |
batteries | 1 9V batteries required. included |
upper temperature rating | 105 Degrees Fahrenheit |
item weight | 4.2 ounces |
voltage | 120 Volts |
item package quantity | 1 |
size | 1-Pack |
material | Plastic |
power source | Corded Electric |
style | Plug in Alarm with Battery Backup |
sensor type | Electrochemical |
batteries required | Yes |

Product Overview
The First Alert CO605 Carbon Monoxide Alarm is a great product for anyone concerned about the safety of their family. This alarm is designed to detect dangerous levels of carbon monoxide in your home and alert you with a loud 85 decibel alarm. It is easy to install, with a simple plug in design that plugs into any standard outlet. It also comes with a battery backup, so it can still monitor carbon monoxide levels during power outages.
The First Alert CO605 features an advanced electrochemical carbon monoxide sensor that is incredibly accurate, giving you peace of mind that you re protected. It also has a single test/silence button, making it easy to use and check the alarm s status. For added convenience, the alarm also has a low battery signal mute, which quiets the low battery signal for up to 8 hours.
This alarm is perfect for anyone looking for a reliable and easy to use carbon monoxide detector. It is especially great for families and those who live in multi level homes, as it is recommended to install one on each level of your home and in each bedroom. The First Alert CO605 also comes with a 7 year limited warranty and has an end of life signal chirp, so you know when it s time to replace the unit for safety.

When it comes to features, the First Alert CO605 has a lot to offer. The easy to install design makes it a breeze to set up, while the reliable electrochemical sensor ensures accurate readings. The battery backup is also a great feature, giving you peace of mind that your family is safe even during power outages. The low battery signal mute is also a great feature, as it prevents false alarms from going off at night and ensures that you ll get an accurate reading when the alarm does go off.
Overall, the First Alert CO605 Carbon Monoxide Alarm is a great product for anyone looking for a reliable and easy to use carbon monoxide detector. The reliable sensor, easy to install design, and battery backup make this alarm a must have for anyone concerned about the safety of their family. With its 7 year limited warranty and end of life signal chirp, you can be sure that this alarm will provide you with reliable protection for years to come. Highly recommended.
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