Internet #309942278

Model # 21027519

0447871105692

Code One Hardwire Smoke and Carbon Monoxide Combination Detector with AA Battery Backup and Voice Alarm (3-Pack)

  • Smoke and CO Alarm requires hardwire installation
  • AA battery backup for protection even during power outages
  • All interconnected alarms will sound when one alarm goes off
Includes 3 units  ($36.33  /unit)
$109.00
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Frequently Bought Together

Frequently Bought Together

Product Overview

Ten years, zero worries, Kidde 10-Year Worry-Free smoke, and carbon monoxide alarms

10-Year Worry-Free by Kidde

Ten years. No battery changes. Zero worries.

Advanced alarms, Kidde FireX smoke, and carbon monoxide

FireX by Kidde

Install confidence with advanced alarms from a world leader in fire safety.

Home fire safety basics, Kidde Code One smoke, and carbon monoxide alarms

Code One by Kidde

Cover the basics of home fire safety.

Identify current power situation, choose the right smoke and carbon monoxide alarm

Know Your Power Source

Identifying your current power situation is an essential step in choosing the right alarm for each room.

No wires, smoke and carbon monoxide alarms run only on batteries

Battery-Powered Alarms

No wires – runs only on batteries. Easy to install. Works during a power outage.

Smoke and carbon monoxide alarms run on your home's electricity, battery backup during outages

Hardwired Alarms

Runs on your home’s electricity. Includes battery backup for protection during power outages.

Kidde recommended smoke and carbon monoxide alarm placement

Product Placement

Recommended placement for combination alarms.

Protect your family, choose the right smoke and carbon monoxide alarm features

Protect Your Family

Protect your family and home. Choose the right features on your alarms.

Eliminates late-night smoke and carbon monoxide alarm battery chirps, $40 in savings

10-Year Longlife

No more late-night battery chirps! Save up to $40 over the life of the alarm.

Smoke and carbon monoxide alarm voice alert, announces danger

Voice Alarm

Voice alert and loud alarm announce danger.

Wireless interconnect, triggers each connected smoke and carbon monoxide alarm

Wireless Interconnect

Wire-free or hardwire interconnect triggers each connected alarm once smoke is detected.

Identifies current state of smoke and carbon monoxide alarm

Ambient Light Ring

Easily identify the current state of the alarm.

Replace smoke and carbon monoxide alarm battery easily, no removal necessary

Front Battery Door

Easily replace the battery without taking the alarm down.

  • Smoke and CO Alarm requires hardwire installation
  • AA battery backup for protection even during power outages
  • All interconnected alarms will sound when one alarm goes off
Hardwired 120 Volt Interconnected Combination Carbon Monoxide and Smoke Alarm provide 2 important safety devices in a single unit. The alarm includes a voice warning system that announces Fire, Carbon Monoxide, Low Battery or Smart Hush 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.
  • 120-Volt with AA battery backup
  • All interconnected alarms will sound when one alarm goes off
  • Intelligent multi sensor alarm
  • Peak level-alerts
  • Smart hush-silences the unit during nuisance alarm situations
  • Add a Kidde Fire Extinguisher to complete your Fire Safe Home
  • Check with your state and local fire and building/safety codes for specific information regarding smoke and carbon monoxide alarms
  • Smoke and carbon monoxide detector utilizes an ionization sensor to detect fire hazards and sounds an 85 db alarm when a hazard is detected
  • Kidde offers a full range of 120-Volt AC wire-in life safety products with interconnect capability to provide the most immediate and complete system available, when any one interconnected alarm is triggered, all interconnected alarms within the home sound an immediate warning
  • Compatible with Kidde, FireX, Code One, and sentinel products
  • UL/CSFM ref. Kidde part KN-COSM-IBA



  • Click here for more information on Electronic Recycling Programs

Product Overview

  • Smoke and CO Alarm requires hardwire installation
  • AA battery backup for protection even during power outages
  • All interconnected alarms will sound when one alarm goes off
Model #: 21027519
Internet #: 309942278

Hardwired 120 Volt Interconnected Combination Carbon Monoxide and Smoke Alarm provide 2 important safety devices in a single unit. The alarm includes a voice warning system that announces Fire, Carbon Monoxide, Low Battery or Smart Hush 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.

  • 120-Volt with AA battery backup
  • All interconnected alarms will sound when one alarm goes off
  • Intelligent multi sensor alarm
  • Peak level-alerts
  • Smart hush-silences the unit during nuisance alarm situations
  • Add a Kidde Fire Extinguisher to complete your Fire Safe Home
  • Check with your state and local fire and building/safety codes for specific information regarding smoke and carbon monoxide alarms
  • Smoke and carbon monoxide detector utilizes an ionization sensor to detect fire hazards and sounds an 85 db alarm when a hazard is detected
  • Kidde offers a full range of 120-Volt AC wire-in life safety products with interconnect capability to provide the most immediate and complete system available, when any one interconnected alarm is triggered, all interconnected alarms within the home sound an immediate warning
  • Compatible with Kidde, FireX, Code One, and sentinel products
  • UL/CSFM ref. Kidde part KN-COSM-IBA



  • Click here for more information on Electronic Recycling Programs

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Name FireX Hardwire Smoke and Carbon Monoxide Combination Detector with 10-Year Battery Backup and Voice Alarm Code One Hardwire Smoke and Carbon Monoxide Combination Detector with AA Battery Backup and Voice Alarm (3-Pack) FireX Hardwire Smoke and Carbon Monoxide Combination Detector with 9V Battery Backup and Voice Alarm (3-Pack) FireX Hardwire Smoke and Carbon Monoxide Combination Detector with 9-Volt Battery Backup and Voice Alarm (3-Pack)
Price
$64.97
$109.00
Was $129.00
$119.00
Save $10.00 (8%)
$149.91 /bundle
Ratings (83) (294) (919) (544)
Alarm Type Carbon Monoxide,Smoke Carbon Monoxide,Smoke Carbon Monoxide,Smoke Carbon Monoxide,Smoke
Power Source Hardwired Hardwired Hardwired Hardwired
Pack Size 1 3 3 3
Alarm Sensor Type Photoelectric Ionization Photoelectric Photoelectric
Alarm/Detector Features 10-Year Battery,Battery Back-Up,Hush Feature,Interconnected,Tamper Resistant,Voice Alert Battery Back-Up,Hush Feature,Interconnected,Voice Alert Battery Back-Up,Hush Feature,Interconnected,Value Pack,Voice Alert Battery Back-Up,Hush Feature,Interconnected,Value Pack,Voice Alert
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Specifications

Dimensions

Product Depth (in.)
1.7
Product Height (in.)
5.75
Product Width (in.)
5.75

Details

Alarm Sensor Type
Ionization
Alarm Type
Carbon Monoxide,Smoke
Alarm/Detector Features
Battery Back-Up,Hush Feature,Interconnected,Voice Alert
Battery Type Required
9-volt
Commercial/Residential
Residential
Connector/Contact Type
None
Fixed or portable
Fixed
Included
Batteries
Pack Size
3
Power Source
Hardwired
Returnable
180-Day
Voltage (volts)
120

Warranty / Certifications

Certifications and Listings
UL Listed

Specifications

Dimensions

Product Depth (in.)
1.7
Product Height (in.)
5.75
Product Width (in.)
5.75

Details

Alarm Sensor Type
Ionization
Alarm Type
Carbon Monoxide,Smoke
Alarm/Detector Features
Battery Back-Up,Hush Feature,Interconnected,Voice Alert
Battery Type Required
9-volt
Commercial/Residential
Residential
Connector/Contact Type
None
Fixed or portable
Fixed
Included
Batteries
Pack Size
3
Power Source
Hardwired
Returnable
180-Day
Voltage (volts)
120

Warranty / Certifications

Certifications and Listings
UL Listed

Questions & Answers

I have multiple units which are an older version (KN-COSM-IB), do I have to replace them all with...

I have multiple units which are an older version (KN-COSM-IB), do I have to replace them all with the updated version if only one is malfunctioning?
Asked by: Robert
The wiring is the same so there are no issues; my units are also different but work fine. Press the test button to insure they all work.
Answered by: Yihoam
Date published: 2020-08-30

Can this unit be installed in a wall?

Can this unit be installed in a wall?
Asked by: Bob9
Yes, it can be installed on the wall, as a close as possible to the ceiling. I have done that several times when I have a suspended ceiling. But also check with your town inspect that they will allow it
Answered by: JohnAnthony
Date published: 2019-05-14

Can I use the Energizer Lithium AA battery as a back up battery ?

Can I use the Energizer Lithium AA battery as a back up battery ?
Asked by: charinsky
yes, any AA battery will work for back up.
Answered by: JC
Date published: 2020-05-10

I need a replacement unit for my old 2011 one. However, the old one has 3 prongs in the back, does this one have these?

Asked by: Susan
Yes. If the connector currently installed is a different configuration (typically there are 2 styles), this one is packed with the correct one for it and installs easily. Work with one wire at a time and there will be no shock hazard.
Answered by: HomeDepotCustomer
Date published: 2018-10-02
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