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Ionization sensing technology - hardwired smoke detector detects invisible fire particles, 85 decibel alarm alerts of fire. Protects during a power failure - combo smoke and CO detector operates on a 120VAC power source with 2-AA battery backup.

Photoelectric smoke detector senses visible fire particles and electrochemical CO detector provides accurate readings. Ul certified, 10-year limited warranty. Hardwired with backup battery - combo smoke and carbon monoxide detector is hardwired into a 120V power source with 9V battery backup.

No battery replacement needed - operates on a long-life lithium battery that lasts for approximately a decade, the entire life of this smoke & carbon monoxide detector. Test & hush button - quickly silence false alarms and easily test the unit to make sure the carbon monoxide smoke detector combo is operating.

Product 2: still works during power failures - smoke alarm with battery backup operates on a 120V power source with 9V battery included. Product 2: test/hush button – it’s simple to test or hush false alarms by pressing the button right on the face of the device.
Product 2: front-load battery door – For quick battery replacements. Product 1: ionization sensing technology - hardwired smoke detector detects invisible fire particles, 85 decibel alarm alerts of fire. Product 1: test-hush feature - silences the unit for approximately 9 minutes; tamper-resistant technology deters removal of the unit from the wall or ceiling.


Advanced technology – smoke and carbon monoxide detector combines ionization & electrochemical sensors to detect invisible fire particles & CO gas. Hush feature silences nuisance or “false” alarms – with just the push of a button on the alarm itself.

Carbon monoxide co alarms four quick beeps, followed by five seconds of silence, followed by four quick beeps. Digital display and peak level button displays the peak CO level recorded by the alarm since it was last reset.
Two alarms in one detects carbon monoxide and explosive gas. Low battery warning feature indicates when the battery needs replacement. Gas alarms one second of alarm on, one second of alarm off, repeating with “GAS” shown in display. Displays CO concentration. Battery backup 9 volt battery included. Loud pulsing alarm that will sound to alert you to a potential problem.


1. Kidde
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Combination Smoke & CO Alarm, Battery Powered, Kidde Smoke & Carbon Monoxide Detector, Voice Alert
#adKidde #ad - Ionization sensor technology - smoke detector detects invisible fire particles, 85 decibel alarm alerts of fire. Ul certified, 10-year limited warranty. Fire. That states, or "Low Battery. ". Protects during a power failure - combo smoke and CO alarm operates on 2-AA batteries.More information #ad
Carbon Monoxide. Fire. Fire and co detector in 1 unit with alert modes, and voice alarm, LED lights, "Warning. Test-hush feature - silences the unit for approximately 8 minutes; tamper-resistant technology deters removal of the unit from the wall or ceiling.Brand | Kidde #ad |
Manufacturer | Kidde Safety #ad |
Height | 5.6 Inches |
Length | 1.8 Inches |
Weight | 0.8 Pounds |
Width | 5.6 Inches |
Part Number | 21026043 |
Model | KN-COSM-BA |
Warranty | 5-year limited warranty |
More information #ad
2. Kidde
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Interconnect Combination Smoke & CO Alarm with Battery Backup, Voice Alert, Kidde Smoke & Carbon Monoxide Detector, Hardwired
#adKidde #ad - Meets safety standards set by Underwriters Laboratories UL and interconnects with other KN-COSM-IBA models. Test-hush feature - silences the unit for approximately 9 minutes; tamper-resistant technology deters removal of the unit from the wall or ceiling.Ionization sensing technology - hardwired smoke detector detects invisible fire particles, 85 decibel alarm alerts of fire. Protects during a power failure - combo smoke and CO detector operates on a 120VAC power source with 2-AA battery backup.
More information #ad
120v ac, all kidde brand hard wired smoke alarms are interconnectable with the KN-COSM-IBA. Ul certified, 10-year limited warranty. Fire & co detector in 1 unit with alert modes, & voice alarm, "Fire! Fire!", LED lights, "Warning! Carbon Monoxide!", that states, or "Low Battery!".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
3. Kidde
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Voice Alerts, Combination Smoke & CO Alarm with Battery Backup, Hardwired Interconnect, Kidde Smoke & Carbon Monoxide Detector
#adKidde #ad - Carbon Monoxide. ". Smoke detector carbon monoxide detector combo – sounds loud 85 decibel alarm with voice alerts that announce "Fire.Photoelectric smoke detector senses visible fire particles and electrochemical CO detector provides accurate readings. Ul certified, 10-year limited warranty. Hardwired with backup battery - combo smoke and carbon monoxide detector is hardwired into a 120V power source with 9V battery backup.
More information #ad
Will interconnect with up to 24 other devices including smoke, CO and heat alarms. Fire. Or "Warning. Easy installation – battery door is on the front for quick replacement.Brand | Kidde #ad |
Manufacturer | Kidde Safety #ad |
Height | 1.85 Inches |
Length | 5.79 Inches |
Weight | 0.7 Pounds |
Width | 5.79 Inches |
Part Number | 21029735 |
Model | KN-COPE-IC |
Warranty | 7 year limited |
More information #ad
4. Kidde
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Kidde Kitchen Smoke Detector & Carbon Monoxide Detector Combo with Long-Life Lithium Battery
#adKidde #ad - Easy to install - automatically activates when attached to mounting bracket. Smoke and carbon monoxide detector in one unit - saves time, money, and space.No battery replacement needed - operates on a long-life lithium battery that lasts for approximately a decade, the entire life of this smoke & carbon monoxide detector. Test & hush button - quickly silence false alarms and easily test the unit to make sure the carbon monoxide smoke detector combo is operating.
More information #ad
Ul certified, 10-year limited warranty. Photoelectric & electrochemical sensing technology work together to reduce false alarms from things like routine cooking - perfect for the kitchen.Brand | Kidde #ad |
Manufacturer | Kidde Safety #ad |
Height | 1.6 Inches |
Length | 5.22 Inches |
Weight | 0.31 Pounds |
Width | 5.22 Inches |
Part Number | 21010170 |
Model | P3010k-CO |
Warranty | 10 year limited warranty |
More information #ad
5. Kidde
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Voice Alert & Smoke Detector, Hardwired, Interconnect Combination Smoke & CO Alarm, Pack of 6, Hardwired Smoke Alarm with Battery Backup, Kidde Smoke & Carbon Monoxide Detector, Test-Silence Button
#adKidde #ad - Product 2: ionization sensing technology - hardwired smoke detector senses invisible fire particles, 85 decibel alarm alerts of fire. Product 1: protects during a power failure - combo smoke and CO detector operates on a 120VAC power source with 2-AA battery backup.Product 2: still works during power failures - smoke alarm with battery backup operates on a 120V power source with 9V battery included. Product 2: test/hush button – it’s simple to test or hush false alarms by pressing the button right on the face of the device.
More information #ad
Product 1: fire & co detector in 1 unit with alert modes, "Fire! Fire!", that states, "warning! Carbon Monoxide!", LED lights, & voice alarm, or "Low Battery!". Product 2: front-load battery door – For quick battery replacements. Product 1: ionization sensing technology - hardwired smoke detector detects invisible fire particles, 85 decibel alarm alerts of fire. Product 1: test-hush feature - silences the unit for approximately 9 minutes; tamper-resistant technology deters removal of the unit from the wall or ceiling.
Brand | Kidde #ad |
More information #ad
6. Kidde
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Voice Alert, Pack of 2, Interconnect Combination Smoke & CO Alarm with Battery Backup, Kidde Smoke & Carbon Monoxide Detector, Hardwired
#adKidde #ad - Protects during a power failure - combo smoke and CO detector operates on a 120VAC power source with 2-AA battery backup. Ionization sensing technology - hardwired smoke detector detects invisible fire particles, 85 decibel alarm alerts of fire.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. Fire & co detector in 1 unit with alert modes, & voice alarm, "Warning! Carbon Monoxide!", that states, led lights, "Fire! Fire!", or "Low Battery!".Brand | Kidde #ad |
Manufacturer | Kidde #ad |
Height | 5.6 Inches |
Length | 2.64 Inches |
Weight | 0.75 Pounds |
Width | 1.8 Inches |
Part Number | 900-0114A |
Model | KN-COSM-IBA |
Warranty | 10 year limited manufacturer |
More information #ad
7. Kidde
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Voice Warning, Kidde Smoke & Carbon Monoxide Detector, Hardwired with Lithium Battery Backup
#adKidde #ad - Hardwired alarm with tamper proof backup battery – to help protect your home and family during power outages, eliminates the need for battery replacement.Advanced technology – smoke and carbon monoxide detector combines ionization & electrochemical sensors to detect invisible fire particles & CO gas. Hush feature silences nuisance or “false” alarms – with just the push of a button on the alarm itself.
More information #ad
Interconnect alarms – allows you to connect up to 24 Kidde devices of this type, giving you trusted detection throughout your home. 85db alarm & voice warnings – “fire. Or “warning: carbon monoxide” so you know why the smoke & carbon monoxide detector is sounding. Ul certified, 10-year limited warranty.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
8. Kidde
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Natural, AC-Plug-In with Battery Backup, & Explosive Gas Detector, Digital Display , White, Kidde Nighthawk Carbon Monoxide Detector & Propane
#adKidde #ad - Ul certified, 5-year Limited Warranty. Three convenient mounting options. Easy to install co and explosive gas alarm with three convenient mounting options including AC wall outlet, plugin six foot power cord, or table top.Carbon monoxide co alarms four quick beeps, followed by five seconds of silence, followed by four quick beeps. Digital display and peak level button displays the peak CO level recorded by the alarm since it was last reset.
More information #ad
Kidde’s carbon monoxide alarms meet the requirements of Underwriters Laboratories UL, an independent facility that tests products for compliance with widely-accepted safety standards. Two alarms in one detects carbon monoxide and explosive gas. Low battery warning feature indicates when the battery needs replacement. Gas alarms one second of alarm on, one second of alarm off, repeating with “GAS” shown in display. Displays CO concentration. Battery backup 9 volt battery included. Loud pulsing alarm that will sound to alert you to a potential problem.
Brand | Kidde #ad |
Manufacturer | Kidde #ad |
Height | 11 Inches |
Length | 2 Inches |
Weight | 1 Pounds |
Width | 8 Inches |
Part Number | KI-21006677 |
Model | KN-COEG-3 |
Warranty | 5 Year Limited |
More information #ad
9. Kidde
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Kidde Carbon Monoxide Detector, AC Plug-In with Battery Backup, CO Alarm with Replacement Alert
#adKidde #ad - Plug-in that still works during a power failure - 2-AA batteries included provide backup for your CO alarm in the event of a power outage. Co detector alerts with a loud 85dB warning signal indicating dangerous levels of carbon monoxide in your home.More information #ad
Ul certified, 10-year limited warranty. Easy & quick installation - plugs into any standard AC wall outlet. Purchase multiple alarms for whole-home detection - place 1 carbon monoxide detector on each level of your home & outside each sleeping area to help protect against poisonous CO gas.Brand | Kidde #ad |
Manufacturer | Kidde #ad |
Height | 4.5 Inches |
Length | 2.75 Inches |
Weight | 0.04 Pounds |
Width | 1.5 Inches |
Part Number | 900-0263 |
Model | KN-COB-DP2 |
More information #ad
10. Kidde
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Lithium Battery Powered, Interconnect Combination Smoke & CO Alarm, Voice Alert, Kidde Smoke & Carbon Monoxide Detector
#adKidde #ad - Co detector with voice alert modes & LED lights that pulse for power, CO detection, & low battery. Low battery warning feature indicates when the battery needs replacement. Ul certified, 10-year limited warranty.More information #ad
Protects during a power failure - combo smoke and CO alarm operates on a 10-year, sealed lithium battery. Photoelectric sensor technology - smoke detector detects visible fire particles, 85 decibel alarm alerts of fire.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