Specification
Intelligent Alarm — Battery Operated  
Combination Smoke & Carbon Monoxide Alarm
Part Number 900-0216A    Model KN-COSMXTR-BA
Description
The Kidde 900-0216A uses breakthrough technology to offer a 
fast response to real fires, including smoldering and fast-flaming, 
as well as protect you from carbon monoxide and dramatically 
reduce the chance of nuisance alarms. In addition, the Intelligent 
Alarm contains a voice warning that clearly states the present 
danger – smoke or carbon monoxide – and announces “FIRE!” or 
“WARNING! CARBON MONOXIDE!” The Intelligent Alarm com-
bines the detection capabilities of an ionization smoke sensor – 
which is more likely to detect smaller, less visible fire particles, like 
those produced by flaming fires – with that of an electrochemical 
sensor, which is used to detect CO. Since carbon monoxide is 
present in all fires, having both detection chambers work together 
in one alarm is a breakthrough in the fire safety industry. When 
either sensor notices a potential hazard, it will communicate with 
the other. Depending on what is detected, the alarm will adjust 
its smoke sensitivity in order to better discriminate between a real 
hazard and a false one. This constant communication enhances 
the alarm’s overall performance in all fires, and significantly reduc-
es the potential for a nuisance alarm.  
This alarm uses ionization sensing technology. Leading authorities 
recommend that both ionization and photoelectric smoke alarms 
be installed to help insure maximum detection of the various 
types of fires that can occur within the home. Ionization sensing 
alarms may detect invisible fire particles (associated with fast flam-
ing fires) sooner than photoelectric alarms. Photoelectric sensing 
alarms may detect visible fire particles (associated with slow smol-
dering fires) sooner than ionization alarms.
Alarm Warnings
Fire: The red LED will flash and be accompanied by three long 
alarm beeps followed by a verbal warning message “FIRE!”. The 
alarm pattern will repeat until smoke is eliminated.
Carbon Monoxide: Four short alarm beeps followed by a verbal 
warning “WARNING! CARBON MONOXIDE!” This continues until 
the unit is reset or the CO is eliminated.
Low Battery: If any form of battery failure is detected the red 
LED light will flash and the unit will “chirp” once every 60 seconds 
for at least 7 days. The “LOW BATTERY” voice occurs once every 15 
minutes.The green LED will also be flashing twice per second.
Voice Hush Indication: “HUSH MODE ACTIVATED” and “HUSH 
MODE CANCELLED” voice announcement. 
Peak Level Memory: If the alarm had detected a CO level of 
100ppm or higher, the unit will announce “CARBON MONOXIDE 
PREVIOUSLY DETECTED” to warn of the CO incident, when the  
Test/Reset button is pressed.
Features and Benefits
• Voice Alarm – Announces the hazard type detected thereby helping to 
speed up the correct reaction to the hazard detected. Alarm announces 
“Fire Fire” when a smoke or fire hazard is detected and announces 
“Warning Carbon Monoxide” when a CO hazard is detected.
• Combined Carbon Monoxide and Smoke Alarm – A single unit 
can be installed where previously, two were needed. Reduces installa-
tion time and helps to keep home décor attractive.
• Test/Reset Button – Tests alarm circuitry and triggers the voice 
announcement.
• LEDs – Flashing green for normal operation and flashing red for alarm 
condition.
• Low Battery Warning – The unit warns of a low battery condition by 
announcing “low battery” and by initiating an alarm chirp and activat-
ing a flashing red LED.
• Battery Powered – Provides protection even during power outages 
when many fire and carbon monoxide incidents occur.
• Battery Safeguard – The battery door will not close unless the bat-
teries are properly installed.
• Hush
®
 Feature – Temporarily silences nuisance alarms.
Voice Alarm
Announces the hazard type detected.
LEDs
Flashing green for normal operation and flashing red for alarm condition.
Single Test/Reset and Hush
TM
 Button
Tests alarm circuitry and triggers the voice announcement. 
Temporarily silences nuisance alarms.
Front Load Battery Door
Replace the 2 AA batteries without disconnecting from mounting bracket.
Peak Level Memory
Alerts user when the unit has detected CO concentrations  
of 100ppm or higher.
U
L
SIGNALING
LISTED
*Based on accuracy claims 
 of major manufacturers


