Kidde smoke-and-carbon-monoxide alarm, front close-up showing central test/reset button, ventilation slots and indicator window, mounted flush against a plain white ceiling or wall background.

Battery Powered Smoke & Carbon Monoxide Alarm

KN-COSM-BA

The Kidde KN-COSM-BA Combination Smoke & Carbon Monoxide Alarm provides two important safety devices in a single unit. This alarm includes a voice warning system that announces “Fire, Carbon Monoxide, Low Battery and Smart HushTM 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 technologically advanced combination alarm is battery operated protecting you and your family even during a power outage when many incidences occur.

  • Voice Alarm
    Announces the hazard type detected.

  • LEDs
    Two LEDs are provided. Flashing green for normal operation
    and flashing red for alarm condition.

  • Single Test/Reset and Hush™ 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

Helpful Resources

Upgrade to

This model is to be replaced with 30CUDR

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Smoke and carbon monoxide alarm (Kidde) shows a green LED; circular white housing with ventilation slots mounted on a ceiling-like surface against a dark background.View Product
Kidde smoke-and-carbon-monoxide alarm, front close-up showing central test/reset button, ventilation slots and indicator window, mounted flush against a plain white ceiling or wall background.
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Helpful Resources

Click on the video to learn more about how to install your Kidde Smoke and Carbon Monoxide alarm.

Download iconProduct Data Sheet
Download iconUser Guide
Download iconSupport
Thumbnail of the video "Understanding your Fire Alarm Sounds"Play button
A red fire extinguisher and three Kidde smoke/CO detectors (one boxed) stand arranged on a light wood tabletop against a pale wall, accompanied by a round "#1" safety-brand badge.

Why Kidde

As North America's #1 home fire safety brand,* Kidde has been working to help make your home the safest it can be for more than 100 years. Now, our latest smoke alarms and combination smoke + carbon monoxide (CO) alarms are bringing you the next level of fire and CO safety. Help protect what matters most in your life with features like cutting edge technology that send fast alerts to give your family more time to get out safely. And enhanced sensing technology that reduces false alarms often caused by cooking.

*Based on total household installations as of December 2023.