First Alert C0410B Leaflet

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

Easily view CO hazard in PPM , peak CO 
level and other alarm functions.

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

The First Alert Cat. Nos. CO400B and CO410B are battery operated, 3V (two 1.5V 
AA batteries) single station carbon monoxide alarms specifically designed for 
residential and institutional applications including sleeping rooms of hospitals, 
hotels, motels, dormitories and other multi-family dwellings as defined in 
standard NFPA 720. Models CO400 and CO410 comply with UL2034, NFPA 720 
and other agencies that model their codes after the above agencies. 

First Alert CO400B and CO410B feature an electrochemical CO sensor, an 85dB 
horn a silence feature and a red LED that blinks to indicate unit is receiving 
power. The front access battery door allows battery access without removing the 
unit from the wall. The low power warning indicator will cause the alarm to 
“chirp” when the batteries need replacing. The low power warning indicator can 
be silenced for up to 8 hours. An Alarm Action Chart identifies action steps to 
take if unit is in alarm. First Alert CO410B also features a backlit digital display 
that shows visual confirmation of CO levels and has Peak Level Memory, 
remembers and displays the highest levels detected when the Peak Level button 
is pressed. Backlight illuminates only when any button is pressed or unit is in 
alarm. Includes mounting anchors and screws.