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Kidde KN-COSM-IBA Hardwire Interconnectable Combination Carbon Monoxide & Smoke Alarm

  • Hard-Wired Combination Smoke and CO Alarm with Battery Back-Up
  • Voice Warning - Warns of hazard by announcing Fire! or Warning, Carbon Monoxide.
  • Front load battery for easy replacement
  • 10 year alarm life, 10 year warranty ” alarm lasts 40% longer!
  • End of Life Hush®
  • Intelligent Sensor Technology added ” reduces nuisance alarms
  • Similar design to i4618 Smoke Alarm for uniform aesthetics across installations requiring both Smoke and Combo Alarms
  • Test/Reset Button
  • UL 2034 & 217 Listed
  • Battery Safeguard
  • 10-Year Warranty
  • Includes 2AA batteries
Availability: Out of stock
SKU: 21006377-N


The Kidde KN-COSM-IBA (also called 900-0114A) 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. The Intelligent sensor technology combines 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 reduces the potential for a nuisance alarm.

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 flaming fires) sooner than photoelectric alarms. Photoelectric sensing alarms may detect visible fire particles (associated with slow smoldering 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: One chirp followed by warning "LOW BATTERY." The red LED light will flash. This pattern will continue every minute for at least seven days. Under battery power, the "LOW BATTERY" voice only occurs once every 15 minutes.

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 when the Test/Reset button is pressed, the unit will announce "CARBON MONOXIDE PREVIOUSLY DETECTED" to warn of the CO incident.

Features and Benefits

  • Voice Warning - Warns of hazard by announcing “Fire!” or “Warning, Carbon Monoxide.”
  • Smart Interconnect™ – Interconnects up to 24 Kidde devices (of which 18 can be initiating).
  • Battery Backup (2-AA batteries included) – Provides protection during power outages.
  • Front Loading Battery Door – Replace the backup batteries without disconnecting from mounting bracket
  • Battery Lockout System – The battery door will not close unless the batteries are properly installed.
  • Alarm Tamper Resist – Helps deter from tampering and theft.
  • Adjustable Mounting Bracket – Makes installation fast and easy. Works with existing smoke and combination smoke and CO mounting brackets.
  • Peak Level Memory – Announces “CARBON MONOXIDE PREVIOUSLY DETECTED” if alarm has detected a CO level of 100ppm or higher since it was last reset.
  • Hush™ Feature – Silences nuisance alarms for approximately 9 minutes. (Smoke must be present before HushTM is activated)
  • Ionization Sensor Technology – Ideal for detecting fast flaming and other types of fires.
  • Test Button Functions:    – Tests the unit for proper operation – Peak Level memory     – Resets the Carbon Monoxide alarm
  • Green LED – Illuminates to indicate the unit is receiving AC power. Flashes once every 60 seconds to indicate battery only mode. Flashes once per second during alarm to indicate initiating alarm. Flashes once every 16 seconds to indicate smoke or CO previously detected. Flashes every 2 seconds while the alarm is in HUSHTM mode.
  • Red LED – 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.
Part #21006377-N
Product Dimensions5.8”w x 2”d x 6.2h (1 alarm)
Weight1 lb (1 alarm)
Shipping Weight16.2 ounces
ShippingCurrently, item can be shipped only within the U.S.
Batteries2 AA batteries (included)
Smoke/CO AlarmsCombination