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Review of Kidde KN-COSM-IB Hardwire CO and Smoke Alarm with Battery Backup and Voice Warning, Interconnectable
4.10 stars Very Good Form 433 Reviews
Reviewed on: July 06, 2013 Author:
Price Range


Pros & Cons


  • Easy to setup hard wire installation
  • Combines carbon monoxide and ionization smoke alarm
  • Clear and loud voice alerts
  • 9 volts battery backup to operate during power outages
  • Interconnected with other smoke alarms in home
  • Front loading battery for easy replacement without removing the device
  • Reasonable price for its quality and various features


  • False or non-emergency alarms
Review Summary

This is the summary of consumer reviews for Kidde KN-COSM-IB Hardwire CO and Smoke Alarm with Battery Backup and Voice Warning, Interconnectable. The BoolPool rating for this product is Very Good, with 4.10 stars, and the price range is $30.00-$62.00.

The Kidde KN-COSM-IB combines carbon monoxide and ionization smoke alarm, providing two important safety devices in a single unit. It requires hard wire installation powered by home’s electricity in order to provide continuous protection. It easily mounts on the ceiling or wall and comes with a front loading battery installation. This speeds up replacement process by eliminating the need to remove the unit completely and re-installing. The alarm includes a voice warning system that helps eliminate confusion, as it tells you if its detected fire or carbon monoxide, if it needs a new battery or end of life alarm. The alarm also allows you to easily silence nuisance alarms using its convenient Smart Hush feature.

This alarm has 9 volt battery backup, which protects you and your family even during a power outage. This talking combo alarm is powered by your home’s electricity and can interconnect with other smoke alarms in your home. Experts recommend interconnected alarms, because when one sounds, they all sound, providing an early warning against fire by dramatically increasing your ability to hear an alarm anywhere in your home, regardless of where the danger starts. The device is provided with two LEDs - flashing green for normal operation and flashing red for alarm conditions.

However the only concern with the unit is sometimes it chirps non-emergency alarm even 30 seconds even after installing new batteries.

Overall, the Kidde KN-COSM-IB combined with safety and a temper resistant feature is perfect dual detector alarm at a reasonable price. 

User Voice
Kidde KN-COSM-IB Hardwire CO and Smoke Alarm with Battery Backup and Voice Warning, Interconnectable
Quick and easy installation Product needs hard wire installation Visually pleasing and trim line looks Includes battery
Review Group #: 1 Rating :
4.50 stars
7 Reviews See Details
Comprehensive installation and operation End of Life signal Tamper resist tabs mainly for commercial settings Comes with 9 volt battery installed Sometimes chirps every 30 seconds even after installing new batteries
Review Group #: 2 Rating :
4.00 stars
13 Reviews See Details
Inter-connectable: if one detector trips, then all detectors sound alarm and main detector sounds voice warning Supplies both CO and Ionization smoke alarm
Review Group #: 3 Rating :
4.00 stars
15 Reviews See Details
7 years shelf life Short battery life triggers frequent false alarms End of life signal
Review Group #: 4 Rating :
3.50 stars
18 Reviews See Details
Easy to install and replace Verbal alarm feature detects the correct reason for alarm Chirps frequent false alarm
Review Group #: 5 Rating :
3.50 stars
24 Reviews See Details
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Rating : 4.10Very Good
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