First Alert CO615 Plug-In Carbon Monoxide Alarm with Display
- Power Source: Corded Electric
- Sensor Type: Electrochemical
- Alarm: Audible
- Operating Humidity: 10-95% RH
Last refreshed Sep 8, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A dual-power CO alarm that adds a digital display and peak-level memory to the standard plug-in format, with a detachable cord for placement flexibility.
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ASIN: B000Q5VMKGModel: CO615Category: Carbon Monoxide Detectors
Overview
A plug-in carbon monoxide alarm from First Alert with a backlit digital display and AA battery backup. Model CO615 suits anyone who wants CO readings at a glance rather than just a chirp.
Power comes from the wall outlet, with two AA batteries standing by if the power goes out, so monitoring does not stop during an outage. The digital screen adds a peak-level reading, meaning it stores the highest CO concentration it has measured rather than only sounding once a threshold is crossed. Several buyers mount it using the detachable six-foot cord so the display sits at eye level while the plug goes into a lower or blocked outlet.
- Electrochemical CO sensor
- Test and silence button
- End-of-life chirp
- UL tested
Who it's for
Homeowners who want a CO alarm with a visible number instead of a plain chirp, and who have an outlet that is not always at a convenient viewing height.
Pros and cons
- Dual power: outlet plus AA battery backup
- Backlit digital display with peak-level memory
- Detachable 6-foot cord for flexible mounting
- 85 decibel alarm
- 7-year warranty, shorter than First Alert's 10-year models
- Display dims to conserve the battery backup
Performance notes
The electrochemical sensor is what actually measures CO concentration; the digital display exists to report what that sensor reads, including the peak level since the last reset. Dual power means the unit draws from the outlet under normal conditions and switches to the two AA batteries only during a power failure, which is why the batteries tend to last across the unit's rated life rather than needing frequent replacement.
Specifications
| Brand | First Alert |
|---|---|
| Model | CO615 |
| Dimensions & fit | |
| Item Weight | 0.65 pounds |
| Item Dimensions D X W X H | 1.7 × 5 × 3.4 inches |
| Power & efficiency | |
| Power Source | Corded Electric |
| Construction & materials | |
| Enclosure Material | Non-Precious Metal |
| Color | White |
| Included components | |
| Unit Count | 1 |
| Warranty & support | |
| Manufacturer Warranty Description | 7-Year Limited Warranty |
| Other details | |
| Sensor Type | Electrochemical |
| Alarm | Audible |
| Operating Humidity | 10-95% RH |
| Number Of Items | 1 |
| Product Style | Plug In Alarm With Digital Display |
| Mfr Part Number | FATCO615 |
| Builtin Media | 2-Aa Batteries, First Alert Co615 Dual Power Carbon Monoxide Plug-In Alarm, One Carbon Monoxide Alarm, User Manual |
| Item Type Name | Plug-In Alarm With Battery Backup And Digital Display (1 Pack) |
| Item Highlight | CO615, AA Battery Backup |
Frequently asked questions
Does the First Alert CO615 work during a power outage?
Yes. It plugs into a standard outlet for normal use and switches to its two AA batteries if the power goes out.
How long does the First Alert CO615 last before it needs replacing?
It carries a 7-year limited warranty and chirps on its own at end of life, so there is no need to track the date manually once it is running.
Can I mount the CO615 away from the outlet it plugs into?
Yes, it has a detachable 6-foot cord, so the alarm can sit at eye level on a wall while the plug reaches a lower or hidden outlet.