First Alert CO605 Carbon Monoxide Alarm
- Plug-in with 9V battery backup
- Electrochemical CO sensor
- Single test/silence button
- Low battery chirp silence up to 8 hours
- End of life signal
- 7-year limited warranty
Updated 22 days ago · Based on the Amazon listing and published specifications, not hands-on testing.
A simple plug-in CO alarm for bedrooms and rentals that need code-compliant coverage with a backup battery. It has no display, so it alarms without showing levels.
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ASIN: B07GC36RSHModel: CO605BCategory: Carbon Monoxide Detectors
Overview
First Alert designed this alarm to plug into a wall outlet, with an electrochemical sensor watching for carbon monoxide and a backup battery for outages. One button tests and silences it, and it signals when the unit needs replacing.
Plugging in means no wiring and no constant battery drain, while the backup covers outages. It shows no CO reading, and the backup battery still needs occasional changing.
Who it's for
Renters, landlords and homeowners who want outlet-powered CO alarms that meet most codes. People who want readings and peak memory should look at a display model.
Pros and cons
- Plugs into a standard outlet
- Battery backup for outages
- Silences nuisance alarms
- End of life warning
- No CO level display
- Backup battery needs replacing
- Takes up a wall outlet
Performance notes
The electrochemical cell reacts to carbon monoxide molecules, triggering the alarm at set exposure levels. Outlet power runs the unit day to day, and the backup battery takes over only when power drops.
Specifications
| Brand | First Alert |
|---|---|
| Model | CO605B |
| Dimensions & fit | |
| Item weight | 8 ounces |
| Power & efficiency | |
| Power Source | Plug-in with 9V battery backup |
| Construction & materials | |
| Enclosure Material | Plastic |
| Included components | |
| Unit Count | 1 Count |
| Warranty & support | |
| Warranty | 7-year limited |
| Other details | |
| Sensor Type | Electrochemical |
| Silence features | Low battery chirp up to 8 hours, nuisance alarm silence |
| End of life | Audible signal |
| Controls | Single test/silence button |
| BuiltIn Media | 1 First Alert Safety Product |
| Mfr Part Number | CO605B |
Frequently asked questions
How do I stop the low battery chirp on the First Alert CO605B?
It can silence the low battery chirp for up to eight hours. Replace the 9V backup battery to clear it.
Does the First Alert CO605B need to be hardwired?
No. It plugs into an outlet, with a 9V battery backup.
Does the First Alert CO605B detect smoke?
No. It is a carbon monoxide alarm.
How will I know the First Alert CO605B needs replacing?
An end of life signal sounds when the alarm needs to be replaced.