Installation Guide
Worry-Free Living Area 
Plug-In Carbon Monoxide Alarm 
AC Powered with Sealed Lithium 
Battery Backup and Digital Display
Description
The Kidde 900-0280 AC Powered, Plug-in carbon monoxide 
alarm with sealed lithium battery backup and digital display is 
an easy to install unit that provides reliable protection against 
the dangers of carbon monoxide. The 10-year* sealed battery 
offers protection during power outages, prevents unwarranted 
removal of the battery, and eliminates the need for annual 
battery replacement. 
The digital display feature adds an advanced level of protection 
showing CO levels in PPM allowing you to see if levels change. 
This display uses LED technology which allows the CO levels to 
be visible in dark conditions and further distances than other 
alarms that use less visible LCD components. The display will 
automatically adjust brightness level to adapt to ambient light 
conditions, which offers both a brighter display during lighted 
environments and dims to provide a visible, but softer contrast 
at night. The display deactivates when AC power is removed 
to conserve battery life. 
The Kidde 900-0280 has a 10-year operational life, which pro-
vides a 40% longer lifespan than other plug-in CO alarms. The 
alarm includes a 10-year limited warranty, and is listed by UL 
to the UL2034 Standard. 
Features and Benefits
•  10 Year Sealed Battery  – Provides protection during power 
outages and does not need replacement during life of the alarm.
•  Digital Display – Displays the level of CO the unit is sensing. 
LEDs provide clear daytime visibility that automatically dims in 
dark conditions.
•  Peak Level Button – Displays the highest level of CO recorded 
since last reset. Ideal for checking previous conditions while 
away or to assist medical responders.
•  Test/Reset Button – Tests the unit for proper operation. Resets 
the Carbon Monoxide Alarm.
•  10-Year End of Life Warning  – Alerts user to replace CO 
alarm after 10 years of operation, as required by UL.
•  Rotating AC Blades – Unit remains vertical whether electrical 
socket is in vertical or horizontal orientation.
•  UL Listed – Listed by UL to the UL2034 Standard..
*10-Year Limited Warranty
10
Part Number: 900-0280
Model KN-COP-DP-10YL
Sealed Lithium Battery Backup 
10-year* tamper proof battery eliminates need for battery replace-
ment. Alerts User to replace alarm after 10 years of operation.
Digital Display 
Displays the level of carbon monoxide the unit is sensing. 
Automatically dims in low light conditions.
Peak Level Memory 
Displays the peak CO level recorded since its last reset.
End of Life Alarm 
Alerts user to replace alarm after 10 years of operation.  
Can be temporarily silenced for convenience. 
No Night Chirps 
End of Life and low battery signals programmed not to occur in dark 
conditions, helping to prevent needless waking of user. 
Ten Year Sealed Battery
Smoke & Carbon Monoxide Alarms


