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Kidde Hardware Combination CO and Smoke Alarm

Protection from two hazards in one unit

The Kidde KN-COSM-IBA 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.

Key Features and Benefits

  • 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 Hush™ 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 HUSH™ 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

Technical Specifications

Power Source:

120VAC, 60Hz 45mA max per alarm; 2 AA battery backup

Smoke Sensor:


CO Sensor:


Audio Alarm:

85dB at 10ft

Temperature Range:

40°F (4.4°C) to 100°F (37.8°C)

Humidity Range:

10%-95% relative humidity, non-condensing


5.6" in diameter x 1.8" depth


.75 lb


Quick connect plug with 6" pigtails


Up to 24 Kidde devices (of which 18 can be initiating)


10year limited

Power-Flo Technologies is proud to support Kidde as one of the leading manufacturers of fire safety products. They believe there is more to safety than just equipment and technology so they collaborate with others in various industries to create a safer world. The most valuable tool to achieve the goal of keeping people safe is knowledge. The Kidde Hardware Combination CO and Smoke Alarm aims to always keep you in the know and protect from possible dangers. With intelligent sensor technology that combines the technology of an ionization smoke sensor with an electrochemical smoke sensor there is constant communication that enhances the alarm's overall performance and keeps you safe.


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