Kidde KN-COSM-B Review – 2 in 1 Carbon Monoxide and Smoke Alarm

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For a complete home security system, you need to have carbon monoxide and smoke detector other than the mandatory CCTV and doors/windows sensors/detectors. Carbon monoxide is a silent killer at home as you cannot feel it without the help of a carbon monoxide detector. On top of that, smoke detector is essential to ensure you are alert when there is possibility of fire happening. Now you can have both carbon monoxide and smoke alarm two safety devices in a single unit. The Kidde KN-COSM-B Battery-Operated Combination Carbon Monoxide and Smoke Alarm with Talking Alarm is exactly what you need for your house.


  • 2-in-1 CO & Smoke alarm
  • Peak Level Memory
  • Voice Warning System
  • Underwriters Laboratories (UL) certified


  • NA


Click Here To See What Others Are Saying About Kidde KN-COSM-B Battery-Operated Combination Carbon Monoxide and Smoke Alarm

Kidde KN-COSM-B carbon monoxide (CO) and smoke alarm is fully battery operated. The alarm just need 3 AA batteries to operate, this eliminates the possibility of malfunction during power failure. Powered by the ionization-sensing technology to detect the smoke, the Kidde KN-COSM-B is capable of detecting the invisible fire particles better than the normal photoelectric alarms.

The Kidde KN-COSM-B has a peak level memory feature, it can remember the highest level of CO detected until a reset button is pressed. This is extremely helpful for investigation by fire department of insurance claims. On top of that, you can actually temporary silence non-emergency alarms by utilizing the hush button. This ensure situation like overcooked smoke or smoking did not trigger the alarm sound.

What Is Special About Kidde KN-COSM-B Carbon Monoxide and Smoke Alarm?

The special feature of Kidde KN-COSM-B alarm is it has voice warning system that can make 4 different types of warning. It can alert you for carbon monoxide, smoke, fire or smart hush activation. This ensure you are fully alert of the type of danger you are in or it is just time for you to change the battery!

Kidde KN-COSM-B Review

Kidde KN-COSM-B has been certified meets requirements of Underwriters Laboratories (UL), an independent facility that tests products for safety compliance. The Kidde KN-COSM-B alarm has a standard lifetime of 7 years. It need to be replace after that for ensure meeting the professional UL2034 requirement. It is common to change a CO and smoke detector after 7 years as the sensors most probably losing the required sensitivity to detect CO and smoke effectively.

For just $30 you can get Kidde KN-COSM-B Battery-Operated Combination Carbon Monoxide and Smoke Alarm, it is definitely value for money. The Kidde KN-COSM-B give you double protection at the lowest cost.

CLICK HERE for special 50% discount on the Kidde KN-COSM-B Carbon Monoxide and Smoke Alarm.

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