First Alert GCO1CN Explosive Gas and Carbon Monoxide Alarm
- Detects CO, methane and propane gases
- 85 decibel audible alarm
- Digital display with peak level
- 9V battery backup, low battery warning
- Limited ten years warranty
Last refreshed Sep 8, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A plug-in alarm that watches for carbon monoxide, natural gas and propane with a digital display and battery backup. It is a gas alarm, not a smoke alarm.
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ASIN: B000H2651YModel: GCO1CNCategory: Carbon Monoxide Detectors
Overview
An outlet near a furnace or a gas appliance is where an alarm like this goes. It senses carbon monoxide with an electrochemical sensor, detects methane and propane, and shows readings on a backlit digital display.
Covering carbon monoxide and combustible gas in one unit saves an outlet and a purchase, and the battery backup lets it work through a power cut. The limit is scope: it is a gas alarm only and the remote that can silence it is not included.
Who it's for
Homes with a furnace, water heater, gas stove or propane use. Anyone who needs smoke detection must add a separate smoke alarm.
Pros and cons
- Detects carbon monoxide and combustible gases
- Digital display with peak level
- Test and silence button
- Ten year limited warranty
- Not a smoke alarm
- Remote not included
- Needs a free outlet
- Battery to replace
Performance notes
An electrochemical sensor reads carbon monoxide, and the same unit senses methane and propane. The display shows current and peak levels, and the alarm sounds again if levels persist after silencing. The battery maintains operation when the outlet loses power.
Specifications
| Brand | First Alert |
|---|---|
| Model | GCO1CN |
| Dimensions & fit | |
| Item Dimensions D X W X H | 2.5 x 7 x 5 inches |
| Power & efficiency | |
| Power Source | Plug in, corded electric, 9V battery backup |
| Construction & materials | |
| Color | Gray and white |
| Included components | |
| Unit Count | 1 Count |
| Warranty & support | |
| Manufacturer Warranty Description | Limited ten years |
| Other details | |
| Sensor Type | Electrochemical |
| Alarm | Audible, 85 decibels |
| Product Style | Digital display |
| Item Type Name | Carbon monoxide, natural gas, methane, propane |
| Mfr Part Number | GC01CN |
| Operating Humidity | 10-95% RH |
Frequently asked questions
Is the First Alert GCO1CN a smoke alarm?
No. It detects carbon monoxide and combustible gas, not smoke.
Does the First Alert GCO1CN have battery backup?
Yes. The listing names a 9V battery backup and a low battery warning.
What gases does the First Alert GCO1CN detect?
Carbon monoxide, natural gas, methane and propane.
Does the First Alert GCO1CN come with a remote?
No. The description says a household remote is not included.