First Alert CO615 Plug-In Carbon Monoxide Alarm with Battery Backup and Digital Display
A plug-in CO alarm with a 6-foot cord and a backlit display, held back by replaceable AA backup batteries and a shorter warranty.
Updated
- 6-foot power cord for shelf or tabletop placement
- Backlit digital display readable in the dark
- Two replaceable AA backup batteries with a low-battery warning
- 85 dB alarm at 10 feet, test and silence button
- 7-year limited warranty, end-of-life warning (First Alert)
Best For / Not For
Best for
- Rooms where the only outlet is low or hidden but a shelf is close by
- Buyers who want a CO readout and are fine changing AA batteries
Not for
- Buyers who want to install an alarm and forget it (a sealed-battery model is simpler)
- Anyone who wants the longest warranty available
Key Details
The Cord Is the Reason to Pick It
Most plug-in CO alarms hang directly off the outlet, which puts them wherever the outlet happens to be. The CO615's 6-foot cord lets you plug in low and set the alarm on a shelf or dresser closer to where people breathe and sleep.
Why It Is a Consider
The backup runs on two AA batteries, so someone has to replace them, and the alarm warns you with a low-battery light and sound when they run down. The sealed-battery Kidde and First Alert CO710 remove that chore. First Alert also rates the CO615 with a 7-year limited warranty against 10 years for the Kidde, and its own store lists the CO615 as no longer available for sale. It still does the core job, but most buyers are better served by a sealed-battery model.
Pros and Cons
Pros
- The 6-foot cord gives more placement choice than a direct plug-in
- Backlit display shows the CO level at a glance
- Low-battery indicator and alarm warn you when the backup needs new batteries
Cons
- AA backup batteries need replacing, and a dead backup means no protection in an outage
- 7-year limited warranty, shorter than the 10 years Kidde gives the KN-COP-DP-10YL
- First Alert's own store lists it as no longer available for sale, so stock may thin out
- First Alert's product page does not list peak memory for this model
Bottom Line
Consider the First Alert CO615 if you need a plug-in alarm with a cord to reach a better spot and don't mind changing AA batteries. For most homes, the Kidde KN-COP-DP-10YL or First Alert CO710 is the simpler long-term choice.
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