Kidde Battery Operated Combination Smoke and Carbon Monoxide Alarm with Voice Alert-KN COSM BA - The Home Depot
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Model # KN COSM BA

Internet # 100004653

Battery Operated Combination Smoke and Carbon Monoxide Alarm with Voice Alert

Kidde Battery Operated Combination Smoke and Carbon Monoxide Alarm with Voice Alert

This item has been discontinued.
The Home Depot no longer carries this specific product.

$28.29 / each
  • Easy installation
  • Voice alert announces the hazard type detected
  • Carbon Monoxide and Smoke Alarm combination


Model # KN COSM BA

Internet # 100004653

Combination alarms offer protection from two deadly threats in one unit. This model offer an exclusive voice warning system that eliminates confusion and clearly warns you and your family of a fire or carbon monoxide danger. Voice responds: Fire when smoke is detected, and Warning Carbon monoxide when CO is present. Operated by 3 AA batteries (included) and carries a 5-year limited warranty.

  • Voice alarm - announces the threat type detected thereby helping to speed up the correct reaction to the danger detected
  • Combined carbon monoxide and smoke alarm - a single unit can be installed where previously, two were needed and reduces installation time and helps to keep home decor attractive
  • Test/reset button - tests alarm circuitry and triggers the voice announcement
  • Battery safeguard - ensures the unit cannot be accidentally mounted without batteries installed
  • Contains a hush feature to temporarily silence false alarms
  • Note: product may vary by store

Info & Guides

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Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 
Alarm Sensor Type 
Alarm Type 
Carbon Monoxide,Smoke 
Alarm/Detector Features 
Hush Feature,Voice Alert 
Commercial / Residential 
Commercial / Residential 
Connector/Contact Type 
Power Source 
Voltage (volts) 
Warranty / Certifications
Certifications and Listings 
1-UL Listed 


Rated 4.5 out of 5 by 76 reviewers.
Rated 5.0 out of 5.0 by Simple to install! Easy to install, 5 year warranty, voice messaging alarm and comes with starter batteries. Great features and was slightly cheaper in-store! June 7, 2008
Rated 4.0 out of 5.0 by Alarm that Works This smoke alarm works well. It is easy to install and will give you an audible warning when the batteries are running low. November 12, 2008
Rated 5.0 out of 5.0 by This alarm has voice alert which tells you what kind of danger is present. This combo alarm protects your family from both fire and CO poisoning. Voice alert, in addition to alarm beeps, tells you what kind of danger is present. It's very important when you have short time for action. Battery operation makes installation easy: you don't have to do wiring connections. April 30, 2014
Rated 5.0 out of 5.0 by Saved My Life and Property! I was just buying a few more detectors for our NEW home, after a serious fire in 2010 badly damaged our little cabin. A combination of the breaking glass and the smoke detector woke me up at 12:30 a.m. to find our home ablaze from a broken porch light (my review of THAT product is very poor!). Thank God it woke me up and it also scared all of our pets safely out the doggie door, too. I was able to turn on a nearby water hose and battle the fire until help arrived. It wasn't a total loss, thanks to these wonderful detectors, that also detect CO2, as well. September 24, 2013
Rated 5.0 out of 5.0 by Worked in a CO emergency We purchased two of these when we bought our house. Our heat exchanger in the furnace went and at 1:30 AM we were awaken by the detector in my baby's room "beep beep beep Carbon Monoxide!" At first I thought it was a fluke because nothing seemed to be wrong, so I reset the detector and went back to bed. One minute later the detector went off again. Then I knew something was very wrong. When the firefighters arrived they said without these detectors, me, my husband and my two sons (16 months and 10 weeks) would have died. I would recommend this detector a million times over. My family owes their life to this detector. March 20, 2007
Rated 5.0 out of 5.0 by Excellent Product This smoke and carbon dioxide detector provides protection from two potentially deadly threats, fire and carbon dioxide poisoning. It was a great value and very easy to install. The built in voice feature speaks clearly "Fire! Fire!" Along with a very shrill alarm tone anytime there is smoke present. It also verbally warns of CO and sounds the alarm tone. I was so impressed with this detector that I went back to Home Depot and bought three more to protect my family. I highly recommend this product. December 30, 2014
Rated 5.0 out of 5.0 by Kidde CO detector as backup This unit was purchased as a backup to a AC/battery unit. If the permanently installed unit alarms, we will use this unit to remeasure the environment before evacuating. I bought a Kidde rather than a cheaper off-brand as a matter of trust. Satisfied with the unit and delivery April 14, 2015
Rated 5.0 out of 5.0 by You save and safe I will recommend this product to all. It's very reliable whether you are outside your house or faraway from the kitchen, or while you're sleeping, because the sound of this alarm is loud. It has a voice that can tell you if there's a fire or there's a carbon monoxide. It's easy to install and easy to follow the instruction. At the same you save money because it's two in one. You don't have to buy the smoke and carbon monoxide detector separately. It's already here in this product. October 19, 2006
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