First Alert Plug-In Combination Explosive Gas & Carbon Monoxide Alarm GCO1CN — Backlit Display, 9V Battery Backup

The First Alert Plug-in Combination Explosive Gas & Carbon Monoxide Alarm (GCO1CN) is a plug-in safety detector that monitors propane, natural/methane gas and carbon monoxide, displaying current and peak readings while sounding an 85 dB alarm and offering battery backup.

Keeping living spaces safe from invisible gas hazards is easier with a single device that tracks both flammable fuels and carbon monoxide. The GCO1CN combines an electrochemical CO sensor with combustible-gas sensing to provide continuous monitoring from a standard AC outlet. Its backlit digital display, peak-read function and test/silence control make it practical for kitchens, utility rooms and any area with fuel-burning appliances.

How does this alarm detect both explosive gases and carbon monoxide?

The unit pairs a combustible-gas sensor for propane and natural/methane with an electrochemical carbon monoxide sensor, which gives precise CO readings. When either hazard exceeds safe thresholds, the detector triggers a loud 85-decibel horn and displays the measured level on the screen.

• Electrochemical sensor for accurate CO detection
• Combustible-gas sensor for propane and methane leaks
• Backlit numeric display of current levels
• Loud 85 dB alarm to alert occupants

What are the installation and power options?

Installation requires no tools: plug the GCO1CN into any standard AC outlet or mount it above an outlet and plug in the longer cord. A user-replaceable 9-volt battery provides backup so the unit continues to operate during power outages.

• Plug-in design for quick setup—no mounting hardware needed
• Optional higher line cord placement for wall mounting above outlets
• 9-volt battery backup included for uninterrupted protection
• Low-battery alert reminds you when to replace the battery

How do I read the display and respond to alerts?

The large backlit display shows real-time gas and CO concentrations along with a peak level history so you can spot intermittent problems. A test/silence button lets you confirm operation, temporarily mute nuisance alarms, and review the highest recorded reading.

• Clear backlit digital readout of current and peak values
• Peak level recall to identify past exposure events
• Test/silence button to check functionality and silence non-threatening alarms
• Compatible with most household remotes to remotely mute alarms

What safety features and certifications are included?

The GCO1CN is UL listed and engineered to notify occupants of persistent hazardous levels through both sound and visible readouts. Its design emphasizes reliable detection with user alerts for low battery and sensor performance checks.

• UL listing for recognized safety standards
• 85-decibel horn to ensure audible warning throughout living spaces
• Low-battery warning to maintain continuous function
• Included 9-volt battery and user manual for immediate use

Who is this for: The First Alert GCO1CN is suited for homeowners, renters and property managers who want combined protection against flammable gas leaks and carbon monoxide from one plug-in device. It fits kitchens, basements, garages and rooms with fuel-burning appliances where visible installation and easy monitoring are priorities. Choose this model if you want clear numeric readings, peak history, battery backup and a simple plug-and-play setup without sacrificing detection for multiple gas types.