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Customer Images (5)
  • Combination Smoke and Carbon Monoxide Alarm with Voice
  • November 23, 2011
  • Recommended Product

First Installed this Kiddie M/N# KN-COSM-B combo smoke/CO alarm in October of 2004. It worked fine the entire time it was installed. it uses (3) AA batteries not the typical 9V. The voice prompts (when testing and low battery) are clear and loud enough to hear easily. On the negative side, It hit it's built in expiration date the night before last at 3AM. (7 years and 1 month after the initial installation) Would be nice if they could build it to last 10 years - but then i guess they'd sell less of them because I plan to buy another..Excerpt from the owners manual about built-in end-of-life countdown timer included below...(from page 5)• After seven (7) years of cumulative power up, this unitwill “chirp” every 30 seconds. This is an "operational endof life" feature which will indicate that it is time to replacethe alarm.


Shawnee, KS
25 out of 25 people found this helpful
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By: SaturdayMorning
  • 7 yr lifespan, worth price
  • February 04, 2013
  • Recommended Product

mine just went out last week, after 7 years of faithful service, with no malfunctions along the way. Kiddie makes a great detector, and they have never let me down. This is a great buy, but they do have an even better model out now. This time around, I will be upgrading to the li-ion battery version with a 10 year lifespan ... that's three extra years of expected life, and no batteries to change, plus you get to keep all the same features. And at about $10-$15 more than the standard AAA version, the "higher" price really just buys all those AAA's that you won't need to install... saving you time, and putting less batteries in a landfill!!

Pros: Easy to Use, Lots of Features, Clear Instructions, Nice Design, Easy Installation, warns you of low battery Cons: has batteries to change
  • DIY


35 to 44,Female
22 out of 22 people found this helpful
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By: OhioHomeowner
  • Kidde CO/Fire works perfectly!
  • August 12, 2013
  • Verified Purchase & Recommended Product

I replaced my Kidde CO/fire alarms after I had a CO problem in my apartment. Woke me up (loudly) when I was sleeping and the alarm system made sure I was safe! Excellent product. The voice alarm for which aspect is alarming is very useful since I was feeling pretty disorientated. Only good things to say about this!

Pros: Easy to Use, Great Sound Quality, Loud, Compact, Easy Replacement, Battery Length, Clear Instructions, Nice Design, Easy Installation

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  • DIY


25 to 34,Female
19 out of 19 people found this helpful
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  • great product
  • January 14, 2014
  • Verified Purchase & Recommended Product

Put one of these units in 5 years ago. Last month the carbon monoxide alarm went off. Called the gas company they came and couldn't find a problem, suggested the alarm was bad. So I bought a new one. That one went off too and after they returned again they found the the heat exchanger on my furnace was cracked and putting co2 into the house. So the sensor saved my family. If you don't have one in your house, get one.

Pros: Battery Length, Loud, Great Sound Quality, Easy Installation
  • DIY


New Jersey, USA
55 to 64,Male
18 out of 18 people found this helpful
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By: dyidave
  • A must have
  • July 20, 2010
  • Recommended Product

As a career firefighter, I recommend this detector to residents off the record. I have two of these in my house and have never had any false alarms. Well worth the price for the combo. This product could save your life

  • Top 50 Contributor


Cleveland, OH
15 out of 15 people found this helpful
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By: HDKevin
  • Well Satisfied with our four
  • June 30, 2012
  • Recommended Product

We think the one's We have saved our lives the other night when the hot-water heater vent pipe caused fumes to fill the house, shortly after We retired for bed. We awoke with 2 beeping and stating that there was a carbon monoxide warning. We opened all windows and doors and shut off the gas line to the water heater and after 2 hours were able to go back to bed when the threat was over. "Thanks to Kidde" Pat & Etta P.


East Peoria, Ill.
14 out of 14 people found this helpful
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By: birdbrain
  • Very Good
  • January 19, 2012
  • Verified Purchase & Recommended Product

The Kidde Battery Combination and Carbon Monoxide Alarm with Voice Alert is a very good device when trying to protect your home from fire or carbon monoxide. The voice feature and alarm are loud enough to be heard throughout the house. The one flaw is the smoke detector is so sensitive that the alarm goes off almost every time you cook. I do not mind because I rather have my family and property safe than sorry.

  • DIY


35 to 44,Male
10 out of 10 people found this helpful
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By: sipone
  • This product is easy to install.
  • March 18, 2014
  • Verified Purchase & Recommended Product

I purchased this product to replace an expired smoke detector in a family room containing a fire place. This unit was very easy to install with basic tools found in any home and has a front panel that makes battery replacement a snap. The unit is neutral color and blends in well. It does not give false alarms as many units I have owned in the past did. I highly recommend this unit.

Pros: Clear Instructions, Easy Installation

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  • DIY


Pittsburgh, PA, USA
45 to 54,Male
9 out of 9 people found this helpful
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By: JoeHomeowner
  • Frequent False Alarms
  • December 05, 2011

I purchased this item to replace a wired in model. It worked fine for two months and then began alarming occasionally. I cleaned the detector by vacuum and pressurized air, but it alarmed again after a week. It has done that several times. I have added other alarms to validate that there is no CO present. This item appears to be overly sensitive to dust or other particles.

  • Pro


Hartland, WI, USA
65 or over,Male
7 out of 7 people found this helpful
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By: Paulander
  • Fabulous product !
  • June 17, 2014
  • Verified Purchase & Recommended Product

This product was my first choice when shopping for a replacement. The price was reasonable, the style was sleek. The color is a neutral white which blends with any wall color. Easy installation, comes with batteries and screws. The voice activation is an added feature and is an exceptional idea in emergency circumstances. I rate this product five stars! I have bought six for my entire apartment building!

Pros: Easy to Use, Great Sound Quality, Compact, Clear Instructions, Stylish, Nice Design, Easy Installation

Video & Photos

  • DIY


Oak Lawn, Illinois
45 to 54,Female
4 out of 4 people found this helpful
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By: Blanche