First Alert CO605 Plug-In Carbon Monoxide Detector
- Electrochemical carbon monoxide sensor
- Battery backup for power outages
- 7 year limited warranty
- Test and mute button, UL listed
- 4.2 ounces, plugs into a wall outlet
Last refreshed Sep 8, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A plug-in carbon monoxide alarm with an electrochemical sensor, a battery backup and a single test and mute button. It works as a standalone unit, not as part of a wired or interconnected system.
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ASIN: B000ND74XAModel: CO605Category: Carbon Monoxide Detectors
Overview
Plugging this alarm into a wall outlet starts the monitoring, with no mounting. The electrochemical sensor watches for carbon monoxide, and a battery takes over if the outlet loses power.
Simple setup and backup power are the reasons to buy, and the mute button handles nuisance alarms. The limits are scope and display, since it has no screen and works alone without linking to other alarms.
Who it's for
Homes with fuel burning appliances or an attached garage. Buyers who want readings on a screen or linked alarms should look at a different model.
Pros and cons
- Plug-in, no mounting
- Single test and mute button
- UL standards met
- Needs a free outlet
- Battery to replace
Performance notes
The sensor reacts to carbon monoxide and sounds the alarm when levels pass its threshold. The mute button silences nuisance alerts, and the same button tests the alarm. During a power cut the battery takes over monitoring.
Specifications
| Brand | First Alert |
|---|---|
| Model | CO605 |
| Dimensions & fit | |
| Item Dimensions D X W X H | 1.38 x 5 x 3.4 inches |
| Item weight | 4.2 ounces |
| Capacity & performance | |
| Upper Temperature Rating | 105 °F |
| Power & efficiency | |
| Power Source | Corded electric, battery backup |
| Construction & materials | |
| Enclosure Material | Plastic |
| Color | White |
| Compatibility & installation | |
| Compatible Devices | Standalone wall outlet |
| Included components | |
| Unit Count | 1 Count |
| Warranty & support | |
| Manufacturer Warranty Description | 7-year limited |
| Other details | |
| Sensor Type | Electrochemical |
| Alarm | Carbon monoxide |
| Product Style | Plug in alarm with battery backup |
| BuiltIn Media | Alarm, Battery |
| Item Type Name | CO Alarm |
| Mfr Part Number | FATCO605 |
| Operating Humidity | 10-95% RH |
Closest rivals on specs
Kidde KN-COB-LP2 Portable Carbon Monoxide Detector- Item Weight 0.26 vs 0.23 pounds (+13%)
Kidde COPD Plug-In Carbon Monoxide Detector- Item Weight 0.26 vs 0.43 pounds (-40%)
Kidde COP Plug-In Carbon Monoxide Detector- Item Weight 0.26 vs 0.43 pounds (-40%)
Frequently asked questions
Can the First Alert CO605 link with other alarms?
The listing says standalone wall outlet use, with no interconnect described.
Does the First Alert CO605 have battery backup?
Yes. The listing names a plug in alarm with battery backup.
Does the First Alert CO605 have a display?
No. The description says there are no complicated displays or settings.
What warranty covers the First Alert CO605?
A 7-year limited warranty.