First Alert CO615 Plug-In Carbon Monoxide Alarm with Display
- Plug-in with battery backup, two AA batteries included
- Electrochemical sensor, backlit digital readout
- 85 decibel horn, test and silence button
- 1.7 x 5 x 3.4 inches, 10.4 ounces
- 7-year limited warranty, UL listed
Last refreshed Sep 8, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A plug-in carbon monoxide alarm with a backlit readout and battery backup for outages. The batteries are backup only, so it needs a powered outlet for everyday use.
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ASIN: B000Q5VMKGModel: CO615Category: Carbon Monoxide Detectors
Overview
Plugging into any wall outlet is all the setup this carbon monoxide alarm needs. An electrochemical sensor reads the air, a backlit digital screen shows the concentration, and AA batteries take over if the power drops.
The backlit display lets you check levels at a glance instead of waiting for the horn. Battery backup covers a power outage, but the listing says that battery is not meant to run the alarm for long without AC power. When the end-of-life chirps sound, the whole unit is replaced.
Who it's for
A home with a free outlet near sleeping areas gets a readout and an audible alarm in one unit. Shoppers who need protection in a place without mains power should look at battery-only models, since the battery here is for backup.
Pros and cons
- Backlit digital ppm readout
- Battery backup for power outages
- Test and silence button
- End-of-life chirp alert
- Needs a working outlet for normal use
- Backup battery not meant for long outages
- Alarm trigger levels not listed
- Whole unit replaced at end of life
Performance notes
An electrochemical sensor reacts to carbon monoxide in the air around the outlet, and the screen shows the reading in parts per million. If levels persist after the horn is silenced, the alarm sounds again. The unit only reads the air where it is plugged in, so placement decides what it can warn about.
Where it stands among carbon monoxide detectors
- #1 most-searched brand and model of the 17 carbon monoxide detectors lines we track (by search demand, not sales).
From the specs of the 30 carbon monoxide detectors we list; not a test result.
Specifications
| Brand | First Alert |
|---|---|
| Model | CO615 |
| Dimensions & fit | |
| Item Dimensions D X W X H | 1.7 x 5 x 3.4 inches |
| Item weight | 10.4 ounces |
| Power & efficiency | |
| Power Source | Corded electric with battery backup |
| Construction & materials | |
| Enclosure Material | Non-precious metal |
| Color | White |
| Included components | |
| Unit Count | 1 Count |
| Warranty & support | |
| Manufacturer Warranty Description | 7-year limited warranty |
| Other details | |
| Sensor Type | Electrochemical |
| Alarm | Audible, 85 decibel horn |
| Builtin Media | Alarm, 2 AA batteries, user manual |
| Display | Backlit digital readout |
| Certification | UL listed |
| Batteries | 2 AA, included |
| Item Highlight | CO615, AA Battery Backup |
| Item Type Name | Plug-In Alarm with Battery Backup and Digital Display (1 Pack) |
| Mfr Part Number | FATCO615 |
| Operating Humidity | 10-95% RH |
| Product Style | Plug in Alarm with Digital Display |
Frequently asked questions
Can the First Alert CO615 run on batteries alone?
The listing describes the batteries as backup only, not meant to power the alarm for an extended period without AC. It needs a powered outlet for normal use.
What does the three-chirp signal on the CO615 mean?
An end-of-life alarm of three chirps tells you to replace the unit.
Is the First Alert CO615 a smoke alarm?
No. The listing describes a carbon monoxide alarm and mentions no smoke detection.
What comes with the First Alert CO615?
One carbon monoxide alarm, two AA batteries and a user manual.