Installation Guide
AC Wire-in Combination  
Carbon Monoxide & Smoke Alarm
  – 120VAC Direct Wire with Battery Backup  
  – Alarm/Voice message warning system
  – Permanent independent carbon monoxide and smoke alarm sensors
Part Number 21006377 (Previously 900-0114)    Model KN-COSM-IB
Description
The Kidde 2106377 Combination Carbon Monoxide & Smoke 
Alarm provides two important safety devices in a single unit. This 
alarm includes a voice warning system that announces “Fire, 
Carbon Monoxide, Low Battery or Smart Hush
TM
 Activation”. The 
voice alarm eliminates any confusion and clearly warns you and 
your family of a smoke or carbon monoxide danger, or if your 
battery is in need of replacement. This technically advanced com-
bination alarm includes 9V battery backup providing protection 
even during a power outage when many incidences occur. The 
2106377 is an easy to install alarm that is suitable for all living 
areas. It has a 7-year life and a 5-year limited warranty.
Alarm Warnings
Fire: The red LED will flash and be accompanied by three long 
alarm beeps followed by a verbal warning message “FIRE! FIRE!”.  
The alarm will repeat pattern 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: One chirp followed by warning “LOW BATTERY”. 
The red LED light will flash.  This pattern will continue every minute 
for the first hour.  After the first hour the red LED light will flash 
once every minute accompanied by the chirp sound. The “LOW 
BATTERY” warning will only sound once every fifteen minutes.
Voice Hush Indication: “HUSH ACTIVATED” and “HUSH 
CANCELLED” voice announcement 
Peak Level Memory: If the alarm had detected a CO level of 
100ppm or higher when the Test/Reset button is pressed, the 
unit will announce “CO PREVIOUSLY DETECTED” to warn of  
the CO incident. 
Features and Benefits
• SmartInterconnect
TM
 – Interconnects up to 24 Kidde devices
  (of which 18 can be initiating).
• BatteryBackup(9Vbatteryincluded) – Provides protection 
  during power outages.
• BatteryLockoutSystem – Minimized risk of mounting unit  
  without installation of battery.
• AlarmTamperResist – Helps deter from tampering and theft.
• AdjustableMountingBracket – Makes installation fast and easy.
• PeakLevelMemory – Announces “CO previously detected”  
  if alarm had detected a CO level of 100ppm or higher since  
  it was last reset.
• SmartHush
TM
 Feature – Silences nuisance alarms for 
  approximately 10 minutes. (Smoke must be present before  
  Smart Hush
TM
 is activated)
• IonizationSensorTechnology – Ideal for detecting fast  
  flaming and other types of fires.
• TestButtonFunctions
    – Tests the unit for proper operation
    – Resets the Carbon Monoxide alarm
    – Peak Level memory
• GreenLED
  Illuminates to indicate the unit is receiving AC power.  Flashes every 
  5 seconds to indicate battery only mode. Flashes once per second 
  (until reset) to indicate that the alarm sensed a smoke or CO hazard. 
   Flashes every 2 seconds while the alarm is in HUSH
®
 mode.
• RedLED
  When a dangerous level of smoke or carbon  
  monoxide is detected the red LED will flash.  
  If the unit malfunctions, the red LED 
  will flash and the unit will chirp 
  every 30 seconds.
VoiceWarning
Warns of hazard by announcing “Fire, Fire” or “Warning, Carbon Monoxide”.
Peak Level Memory
Alerts user when the unit has detected CO concentrations of 100ppm or higher.
Smart Hush
TM
Silences the unit during nuisance alarm situations.
(Smoke must be present before hush is activated)
TwoLED’s
 • Red–Alarmmode.
 • Green–IndicatesthatACpowerispresent.
Test/ResetButtonFunctions
 • TeststheunitselectronicsandresetstheunitduringCOalarm.
 • ActivatesHushFeatureandPeakLevelMemory.
AdjustableMountingBracket
Allows for easy installation and alignment.
*Based on accuracy claims of major manufacturers
Alerts user to replace
CO alarm after 7 years
NEW
FEATURE:
Alerts user to replace CO alarm
after 7 years of operation
NEW
FEATURE:
U
L
SIGNALING
LISTED


