First Alert GC01B Leaflet

Three sensors in one alarm: carbon 
monoxide, propane gas and 
natural/methane gas.

Most accurate technology available for 
detecting carbon monoxide as compared to 
other sensing technologies.

Silences low battery chirp for up to 
eight hours or silence nuisance alarm 
for several minutes.

Provides audible and visual notice when 
alarm needs to be replaced.

Alkaline battery backup

First Alert Model GCO1 is a 120V AC plug-in with battery back-up single station 
carbon monoxide and explosive gas (propane and natural/methane) combination 
alarm specifically designed for residential and institutional applications including 
sleeping rooms of hospitals, hotels, motels, dormitories, and other multifamily 
dwellings as defined in standard NFPA 101. Model GCO1 has been fully tested 
and complies with, UL1484, UL2034 and other agencies that model their codes 
after the above agencies. It meets building codes where 120V AC plug-in digital 
display with battery back-up carbon monoxide and explosive gas combination 
alarms are required.

First Alert Model GCO1 is a state of the art carbon monoxide and explosive gas  
combination alarm designed to provide early warning of a carbon monoxide, 
propane or methane gas danger. It features an advanced electrochemical CO 
sensor and a metal oxide explosive gas sensor with an EZ view backlit digital 
display. It plugs in easily into any standard 120V AC outlet. The line cord allows 
for convenient mounting options where methane requires unit to be mounted up 
high and propane should be mounted low. Carbon monoxide mounting location is 
not height sensitive as CO disperses evenly throughout the house. The peak level 
function allows for easy viewing of highest gas levels detected. It has a 9V 
alkaline battery backup, an End of Life feature and single button test/silence. 
This alarm has two silence features. Low Battery Silence: Temporarily silence the 
low battery chirp for up to eight hours. Alarm Silence: Silence alarm for several 
minutes. The End of Life timer provides audible and visual notice when alarm 
needs to be replaced. Battery installation and removal can occur while the unit is 
mounted to the wall or plugged into the electrical outlet via the swing up battery 
cover.  Includes mounting anchors and screws. 

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