As an Amazon Associate I earn from qualifying purchases.
120v ac, all kidde brand hard wired smoke alarms are interconnectable with the KN-COSM-IBA. Fire & co detector in 1 unit with alert modes, "fire! fire!", LED lights, & voice alarm, "Warning! Carbon Monoxide!", that states, or "Low Battery!".

Battery safeguard – The battery door will not close unless the batteries are properly installed. Test/reset button – Tests alarm circuitry and triggers the voice announcement. Voice alarm – announces the hazard type detected thereby helping to speed up the correct reaction to the hazard detected.
Combined carbon monoxide and smoke alarm – A single unit can be installed where previously, two were needed. The unit shall at a minimum meet the requirements of ul 2034, ul217, nfpa72, chapter 11 2002 edition the state of california Fire Marshall, NFPA101 One and two family dwellings Federal Housing Authority FHA, Housing and Urban Development HUD. Alarm announces “fire!” when a smoke or fire hazard is detected and announces “Warning Carbon Monoxide” when a CO hazard is detected.



Intelligent technology - combines ionization & electrochemical sensors to detect invisible fire particles & CO gas, 85 decibel alarm alerts of fire. Ul certified, 10-year limited warranty.

Fire & co detector in 1 unit with alert modes, & voice alarm, that states, led lights, "Warning! Carbon Monoxide!", "Fire! Fire!", or "Low Battery!".

No battery replacement needed - combo smoke and CO detector operates on a non-replaceable, 10-year lithium battery. Ul certified, 10-year limited warranty. Fire & co detector in 1 unit with alert modes, test-silence button, LED light, & Replacement Alert: a chirp that notifies when the unit needs to be replaced.


Eliminates worry about battery removal or unauthorized deactivation of alarm. Voice alarm – announces the hazard type detected thereby helping to speed up the correct reaction. Combination smoke and carbon monoxide alarm – Smoke and CO sensing technologies work together to detect real fires faster and reduce nuisance alarms.

1. Kidde
#ad
Interconnect Combination Smoke & CO Alarm with Battery Backup, Hardwired, Voice Alert, Kidde Smoke & Carbon Monoxide Detector
#adKidde #ad - Meets safety standards set by Underwriters Laboratories UL and interconnects with other KN-COSM-IBA models. Ionization sensing technology - hardwired smoke detector detects invisible fire particles, 85 decibel alarm alerts of fire.120v ac, all kidde brand hard wired smoke alarms are interconnectable with the KN-COSM-IBA. Fire & co detector in 1 unit with alert modes, "fire! fire!", LED lights, & voice alarm, "Warning! Carbon Monoxide!", that states, or "Low Battery!".
More information #ad
Ul certified, 10-year limited warranty. Test-hush feature - silences the unit for approximately 9 minutes; tamper-resistant technology deters removal of the unit from the wall or ceiling. Protects during a power failure - combo smoke and co detector operates on a 120VAC power source with 2-AA battery backup. Temperature Range-40˚F 4. 4˚c to 100˚f 37. 8˚c.Brand | Kidde #ad |
Manufacturer | Kidde Safety #ad |
Height | 6 Inches |
Length | 2 Inches |
Weight | 1 Pounds |
Width | 6 Inches |
Part Number | 21026041 |
Model | KN-COSM-IBA |
Warranty | 10 Year Limited |
More information #ad
2. Kidde
#ad
Kidde Smoke and Carbon Monoxide Detector Alarm with Voice Warning | Battery Operated | Model # KN-COSM-BA | 6 Pack
#adKidde #ad - Battery powered – provides protection even during power outages when many fire and carbon monoxide incidents occur. Low battery warning – the unit warns of a low battery condition by announcing “low battery” and by initiating an alarm chirp and activating a flashing red LED.Battery safeguard – The battery door will not close unless the batteries are properly installed. Test/reset button – Tests alarm circuitry and triggers the voice announcement. Voice alarm – announces the hazard type detected thereby helping to speed up the correct reaction to the hazard detected.
More information #ad
Ionization Smoke Alarm Sensor. Easy to install alarm that is suitable for all liv-ing areas and has a 10-year life and a 7-year limited warranty. Temperature range:40˚f 4. 4˚c to 100˚f 37. 8˚c. Reduces installa-tion time and helps to keep home décor attractive. Combined carbon monoxide and smoke alarm – A single unit can be installed where previously, two were needed. The unit shall at a minimum meet the requirements of ul 2034, ul217, nfpa72, chapter 11 2002 edition the state of california Fire Marshall, NFPA101 One and two family dwellings Federal Housing Authority FHA, Housing and Urban Development HUD. Alarm announces “fire!” when a smoke or fire hazard is detected and announces “Warning Carbon Monoxide” when a CO hazard is detected.
Brand | Kidde #ad |
Manufacturer | Kidde #ad |
Height | 7.3 Inches |
Length | 12.2 Inches |
Weight | 1 Pounds |
Width | 6.7 Inches |
Part Number | KN-COSM-BA |
Model | KN-COSM-BA |
More information #ad
3. Kidde
#ad
Voice Alert, Interconnect Combination Smoke & CO Alarm with Battery Backup, Hardwired, Kidde Smoke & Carbon Monoxide Detector
#adKidde #ad - Protects during a power failure - combo smoke and CO detector operates on a 120V power source with 9V front-loading battery backup. Test-hush feature - silences the unit for approximately 8 minutes; tamper-resistant technology deters removal of the unit from the wall or ceiling.More information #ad
Ul certified, 10-year limited warranty. Photoelectric sensor technology - hardwired smoke detector detects visible fire particles, 85 decibel alarm alerts of fire. Fire & co detector in 1 unit with alert modes, leD lights, & voice alarm, "fire fire", "Warning Carbon Monoxide", that states, or "Low Battery".Brand | Kidde #ad |
Manufacturer | Kidde Safety #ad |
Height | 1.85 Inches |
Length | 5.79 Inches |
Width | 5.79 Inches |
Part Number | 21029735 |
Model | KN-COPE-IC |
Warranty | 7 year limited |
More information #ad
4. Kidde
#ad
Battery Powered, Voice Alert, Combination Smoke & CO Alarm, Kidde Smoke & Carbon Monoxide Detector
#adKidde #ad - Protects during a power failure - combo smoke and CO alarm operates on 2-AA batteries. Fire & co detector in 1 unit with alert modes, led lights, "Warning Carbon Monoxide", "fire Fire", & voice alarm, that states, or "Low Battery".More information #ad
Test-hush feature - silences the unit for approximately 8 minutes; tamper-resistant technology deters removal of the unit from the wall or ceiling. Ionization sensor technology - smoke detector detects invisible fire particles, 85 decibel alarm alerts of fire at 10 feet. Ul certified, 10-year limited warranty.Brand | Kidde #ad |
Manufacturer | Kidde Safety #ad |
Height | 5.6 Inches |
Length | 1.8 Inches |
Width | 5.6 Inches |
Part Number | 21026043 |
Model | 21026043 |
Warranty | 5-year limited warranty |
More information #ad
5. Kidde
#ad
Kidde Smoke & Carbon Monoxide Detector, Hardwired with Lithium Battery Backup
#adKidde #ad - Fire & co detector in 1 unit with alert modes, test-silence button, LED lights, & Replacement Alert: a chirp that notifies when the unit needs to be replaced.Intelligent technology - combines ionization & electrochemical sensors to detect invisible fire particles & CO gas, 85 decibel alarm alerts of fire. Ul certified, 10-year limited warranty.
More information #ad
No battery replacement needed - combo smoke and CO detector operates on a non-replaceable, 10-year lithium battery. Replacement alert - can be silenced for 3 days at a time, maximum of 30 days; tamper-resistant technology deters removal of the unit or battery from the wall or ceiling.Brand | Kidde #ad |
Manufacturer | Kidde Safety #ad |
Height | 5.5 Inches |
Length | 5.5 Inches |
Width | 1.5 Inches |
Part Number | 21029756 |
Model | i12010SCO |
Warranty | 10 year limited warranty |
More information #ad
6. Kidde
#ad
Lithium Battery Powered, Kidde Smoke & Carbon Monoxide Detector, Combination Smoke & CO Alarm with Voice Alert
#adKidde #ad - Ul certified, 10-year limited warranty. Test-hush feature - silences the unit for approximately 8 minutes; tamper-resistant technology deters removal of the unit from the wall or ceiling.Fire & co detector in 1 unit with alert modes, & voice alarm, that states, led lights, "Warning! Carbon Monoxide!", "Fire! Fire!", or "Low Battery!".
More information #ad
Photoelectric & electrochemical sensor technologies - smoke detector detects invisible fire particles, while the carbon monoxide detects poisonous carbon monoxide gas; 85 decibel alarm alerts of fire. Protects during a power failure - combo smoke and CO alarm operates on a sealed, lithium battery.Brand | Kidde #ad |
Manufacturer | Kidde Safety #ad |
Height | 5.22 Inches |
Length | 5.22 Inches |
Width | 1.6 Inches |
Part Number | 21026065 |
Model | P3010CU |
Warranty | 10 year limited |
More information #ad
7. Kidde
#ad
Combination Smoke & CO Alarm with Lithium Battery, Kidde Smoke & Carbon Monoxide Detector, Replacement Alert
#adKidde #ad - Photoelectric & electrochemical sensing technology - combination smoke & CO detector detects visible fire particles, 85 decibel alarm alerts of fire.No battery replacement needed - combo smoke and CO detector operates on a non-replaceable, 10-year lithium battery. Ul certified, 10-year limited warranty. Fire & co detector in 1 unit with alert modes, test-silence button, LED light, & Replacement Alert: a chirp that notifies when the unit needs to be replaced.
More information #ad
Replacement alert - can be silenced for 3 days at a time, maximum of 30 days; tamper-resistant technology deters removal of the unit or battery from the wall or ceiling.Brand | Kidde #ad |
Manufacturer | Kidde Safety #ad |
Height | 1.6 Inches |
Length | 5.22 Inches |
Width | 5.22 Inches |
Part Number | 21010170 |
Model | P3010k-CO |
Warranty | 10 year limited warranty |
More information #ad
8. Kidde
#ad
Battery Powered, Combination Smoke & CO Alarm with Voice Alert, Kidde Intelligent Smoke & Carbon Monoxide Detector
#adKidde #ad - Protects during a power failure - combo smoke and CO alarm operates on 2-AA batteries. Ul certified, 10-year limited warranty. Ionization & electrochemial sensor technologies - smoke detector detects invisible fire particles, while the CO alarm detects poisonous carbon monoxide gas; 85 decibel alarm alerts of fire.More information #ad
Test-hush feature - silences the unit for approximately 9 minutes. Fire & co detector in 1 unit with alert modes, "fire Fire", that states, "Warning Carbon Monoxide", & voice alarm, LED lights, or "Low Battery".Brand | Kidde #ad |
Manufacturer | Kidde Safety #ad |
Weight | 0.01 Pounds |
Part Number | KN-COSM-XTR-BA |
Model | KN-COSMXTR-BA |
More information #ad
9. Kidde
#ad
Kidde 21026065 Smoke & Carbon Monoxide Alarm with Voice Warning
#adKidde #ad - Photoelectric sensor – smoke alarm contains advanced photoelectric sensor that may detect visible particles associated with smoldering fires sooner than ionization alarms.Eliminates worry about battery removal or unauthorized deactivation of alarm. Voice alarm – announces the hazard type detected thereby helping to speed up the correct reaction. Combination smoke and carbon monoxide alarm – Smoke and CO sensing technologies work together to detect real fires faster and reduce nuisance alarms.
More information #ad
Sealed-in lithium battery – sealed-in lithium power supply; No battery replacement required over the 10 year life of the alarm. Alarm announces “fire” when a smoke or fire hazard is detected and announces “Warning Carbon Monoxide” when a CO hazard is detected. Self-activation – Alarm automatically activates when attached to the mounting bracket.Brand | Kidde #ad |
Manufacturer | Kidde Safety #ad |
Height | 5.22 Inches |
Length | 5.22 Inches |
Weight | 0.33 Pounds |
Width | 1.6 Inches |
Part Number | 21026065 |
Model | P3010CU |
Warranty | 10 year limited |
More information #ad
10. Kidde
#ad
Lithium Battery Powered, Kidde Smoke & Carbon Monoxide Detector, Interconnect Combination Smoke & CO Alarm, Voice Alert
#adKidde #ad - Co detector with voice alert modes & LED lights that pulse for power, CO detection, & low battery. Protects during a power failure - combo smoke and CO alarm operates on a 10-year, sealed lithium battery.More information #ad
Low battery warning feature indicates when the battery needs replacement. Photoelectric sensor technology - smoke detector detects visible fire particles, 85 decibel alarm alerts of fire. Ul certified, 10-year limited warranty.Brand | Kidde #ad |
Manufacturer | Kidde Safety #ad |
Height | 5.59 Inches |
Length | 1.91 Inches |
Weight | 0.6 Pounds |
Width | 5.59 Inches |
Part Number | 21027311 |
Model | P4010DCSCO-W |
Warranty | 10-year limited warranty |
More information #ad