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Tamper resist locking pin helps deter alarm tampering and theft. Battery backup - 9v battery backup included. See user’s guide for complete instructions. User-friendly features - tamper resist locking feature deters alarm theft.
Large mounting base makes mounting easier, protects surface paint from dirt and covers imperfections. Tinned strands increase conductivity and wire nut grip. Pre-stripped wiring harness with easy off cap does not require stripper tool. Kidde smoke alarms meet the UL requirements. Battery backup 9V battery included. Hush feature temporarily silences nuisance alarms.

Quick connect power Harness – Makes installation fast and easy. Test button – tests unit’s electronic circuitry, horn and battery function. Green led indicates the presence of AC power.



Fire & co detector in 1 unit with alert modes, that states, "warning! carbon Monoxide!", LED lights, "Fire! Fire!", & voice alarm, or "Low Battery!". Ionization sensing technology - hardwired smoke detector detects invisible fire particles, 85 decibel alarm alerts of fire.

1. Kidde
#ad
Test-Silence Button, Kidde Smoke Detector, Hardwired Smoke Alarm with Battery Backup & Interconnect
#adKidde #ad - Ul certified, 10-year limited warranty. Ionization sensing technology - hardwired smoke detector detects invisible fire particles, 85 decibel alarm alerts of fire. Protects during a power failure - smoke alarm operates on a 120V power source with 9V battery backup.More information #ad
Test-hush feature - silences the unit for approximately 7 minutes. Whole home family protection - place 1 fire detector on each level of your home & in your bedroom - maximum of 24 Kidde smoke or CO detectors can be interconnected in a multiple stations.Brand | Kidde #ad |
Manufacturer | Kidde Safety #ad |
Height | 6 Inches |
Length | 2 Inches |
Weight | 0.74 Pounds |
Width | 6 Inches |
Part Number | 21029727 |
Model | I12040A |
Warranty | 5 Year Limited |
More information #ad
2. Kidde
#ad
Pack of 2, Test-Silence Button, Kidde Smoke Detector, Hardwired Smoke Alarm with Battery Backup & Interconnect
#adKidde #ad - Protects during a power failure - smoke alarm operates on a 120V power source with 9V battery backup. Test-hush feature - silences the unit for approximately 7 minutes. 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. Whole home family protection - place 1 fire detector on each level of your home & in your bedroom - maximum of 24 Kidde smoke or CO detectors can be interconnected in a multiple stations.Brand | Kidde #ad |
Manufacturer | Kidde #ad |
Height | 5.6 Inches |
Length | 2.36 Inches |
Weight | 0.6 Pounds |
Width | 1.55 Inches |
Part Number | i12040 |
Model | I12040A |
Warranty | 10 year limited manufacturer |
More information #ad
3. Kidde
#ad
Hardwired Smoke Alarm with Battery Backup & Interconnect, Test-Silence Button, Pack of 6, Kidde Smoke Detector
#adKidde #ad - Protects during a power failure - smoke alarm operates on a 120V power source with 9V battery backup. Ionization sensing technology - hardwired smoke detector detects invisible fire particles, 85 decibel alarm alerts of fire.More information #ad
Test-hush feature - silences the unit for approximately 7 minutes. Whole home family protection - place 1 fire detector on each level of your home & in your bedroom - maximum of 24 Kidde smoke or CO detectors can be interconnected in a multiple stations. Ul certified, 10-year limited warranty.Brand | Kidde #ad |
Manufacturer | Kidde #ad |
Height | 5.6 Inches |
Length | 2.36 Inches |
Weight | 0.6 Pounds |
Width | 1.55 Inches |
Part Number | i12040 |
Model | I12040A |
Warranty | 10 year limited manufacturer |
More information #ad
4. Kidde
#ad
Kidde i12040 120V AC Wire-In Smoke Alarm with Battery Backup and Smart Hush
#adKidde #ad - Dust cover protects sensor from contaminates during construction reducing nuisance alarms. Fewer callbacks - one button design for easy operation and less confusion. Battery run down protection will shut down alarm memory when AC power is not present, reducing low battery chirp.Tamper resist locking pin helps deter alarm tampering and theft. Battery backup - 9v battery backup included. See user’s guide for complete instructions. User-friendly features - tamper resist locking feature deters alarm theft.
More information #ad
Easy installation - front battery pull tab allows battery activation without removing alarm from mounting bracket. Operates Hush and alarm test. Interconnectable - connect up to 24 devices of which 18 can be initiating including smoke, CO and heat alarms. Large mounting base makes mounting easier, protects surface paint from dirt and covers imperfections. Tinned strands increase conductivity and wire nut grip. Pre-stripped wiring harness with easy off cap does not require stripper tool. Kidde smoke alarms meet the UL requirements. Battery backup 9V battery included. Hush feature temporarily silences nuisance alarms.
Brand | Kidde #ad |
Manufacturer | Kidde #ad |
Height | 6 Inches |
Length | 2 Inches |
Weight | 0.8 Pounds |
Width | 6 Inches |
Part Number | i12040A |
Model | i12040A |
Warranty | 5 Year Limited |
More information #ad
5. Kidde
#ad
White, Kidde 21006371 p12040 Hardwire With Battery Backup Photoelectric Smoke Alarm
#adKidde #ad - Battery pull Tab eliminates battery installation time and keeps battery fresh. Battery backup 9v battery included – Provides continuous protection even during power outages.Quick connect power Harness – Makes installation fast and easy. Test button – tests unit’s electronic circuitry, horn and battery function. Green led indicates the presence of AC power.
More information #ad
Led - red led indicates that the smoke alarm is operating properly, HushTM, and alarm condition. Dust cover protects sensor during construction. Photoelectric sensor – advanced photoelectric sensor may detect visible particles associated with smoldering fires sooner than ionization alarms.Brand | Kidde #ad |
Manufacturer | Kidde #ad |
Height | 6 Inches |
Length | 2 Inches |
Weight | 0.5 Pounds |
Width | 6 Inches |
Part Number | 21006371 |
Model | 21006371 |
Warranty | 5 Year Limited |
More information #ad
6. Kidde
#ad
Battery Powered, Smoke Alarm, Kidde Smoke Detector
#adKidde #ad - Ul certified, 10-year limited warranty. Ionization sensing technology - smoke detector detects invisible fire particles, 85 decibel alarm alerts of fire.More information #ad
Low battery warning feature indicates when the battery needs replacement. Easy installation - smoke detector is powered by a 9-volt battery; no hardwiring required. Test-silence button - allows for test & silence of alarm.Brand | Kidde #ad |
Manufacturer | Kidde Safety #ad |
Height | 1 Inches |
Length | 2 Inches |
Weight | 0.62 Pounds |
Width | 1 Inches |
Part Number | 21026051 |
Model | 21026051 |
More information #ad
7. Kidde
#ad
Kidde Smoke Detector, Hardwired with Battery Backup & Interconnect, Smoke Alarm with LED Lights
#adKidde #ad - Photoelectric sensing technology - hardwired smoke detector detects visible fire particles associated with smoldering fires, 85 decibel alarm alerts of fire. Whole home family protection - place 1 fire detector on each level of your home & in your bedroom - maximum of 24 Kidde smoke or CO detectors can be interconnected in a multiple stations.More information #ad
Ul certified, 10-year limited warranty. Protects during a power failure - smoke alarm operates on a 120V power source with 9V battery backup. Test-hush feature - silences the unit for approximately 7 minutes.Brand | Kidde #ad |
Manufacturer | Kidde Safety #ad |
Height | 6 Inches |
Length | 2 Inches |
Weight | 0.78 Pounds |
Width | 6 Inches |
Part Number | 21006371 |
Model | P12040 |
Warranty | 5 Year Limited |
More information #ad
8. Kidde
#ad
Hardwired, Voice Alert, Interconnect Combination Smoke & CO Alarm with Battery Backup, Kidde Smoke & Carbon Monoxide Detector
#adKidde #ad - Meets safety standards set by Underwriters Laboratories UL and interconnects with other KN-COSM-IBA models. Protects during a power failure - combo smoke and co detector operates on a 120VAC power source with 2-AA battery backup.Fire & co detector in 1 unit with alert modes, that states, "warning! carbon Monoxide!", LED lights, "Fire! Fire!", & voice alarm, or "Low Battery!". 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. Temperature Range-40˚F 4. 4˚c to 100˚f 37. 8˚c. 120v ac, all kidde brand hard wired smoke alarms are interconnectable with the KN-COSM-IBA. 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 |
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
9. Kidde
#ad
Battery Powered, Combination Smoke & CO Alarm, Kidde Smoke & Carbon Monoxide Detector, Voice Alert
#adKidde #ad - Protects during a power failure - combo smoke and CO alarm operates on 2-AA batteries. Ul certified, 10-year limited warranty. Fire & co detector in 1 unit with alert modes, led lights, "Warning Carbon Monoxide", that states, & voice alarm, "Fire Fire", or "Low Battery".More information #ad
Ionization sensor technology - smoke detector detects invisible fire particles, 85 decibel alarm alerts of fire at 10 feet. 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 |
Width | 5.6 Inches |
Part Number | 21026043 |
Model | 21026043 |
Warranty | 5-year limited warranty |
More information #ad