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Model 21006371

Internet #100573489

Store SKU #146389

Hardwired 120-Volt Inter-Connectable Smoke Alarm with Battery Backup

$19.97 /each

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Product Overview

The Kidde P12040 Hardwire inter connectable Photoelectric Smoke Alarm with Battery Backup can act as a stand-alone unit or can be integrated into an existing electrical system. This unit sounds an early warning to alert you and your family of the presence of visible fire particles detected by the alarm's photoelectric sensor. Powered by 120-Volt AC, this alarm protects you, your home and the people you hold dear even during power outages, thanks to a 9-Volt battery backup. A power harness facilitates an easy installation and a simple push of a button activates this alarm's test and hush features.

  • Utilizes photoelectric sensor to detect visible fire particles
  • Sounds an early warning when smoke or fire particles are detected
  • Offers dual functionality as a single-station alarm or can be interconnected into a wired system
  • 120-Volt AC, 2-wire connection
  • Push-button operation tests alarm functionality
  • 9-Volt battery backup provides protection during power outages
  • 9-Volt battery included (21025730)
  • Pull tab keeps battery fresh until initial activation
  • Power harness makes installation fast and easy
  • Dust cover protects sensor during construction


  • Click here for more information on Electronic Recycling Programs

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Customer Questions & Answers

4 Questions2 Answers

Customer Questions & Answers

Hardwired 120-Volt Inter-Connectable Smoke Alarm with Battery Backup
Hardwired 120-Volt Inter-Connectable Smoke Alarm with Battery Backup

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1 answer

Why does my smoke alarm keep beeping?

This question is from Hardwired 120-Volt Inter-Connectable Smoke Alarm with Battery Backup
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January 31, 2016
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New York City, NY
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Home Improvement Profile: Other
June 24, 2016
Answer: 
Consider replacing the battery. It could have come with a defect one. Check for loose or mismatched wires.
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1 answer

Full alarm sound after AC connection

This question is from Hardwired 120-Volt Inter-Connectable Smoke Alarm with Battery Backup
Asked by
Boston, MA
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August 3, 2015
Followed the installation instructions and installed two of these alarms in the basement. They tested ok with only battery power. I then turned on the AC power and the alarms sounded their full blast alarms continuously and refused to stop. I found some reset procedures on the FIREX site, followed those instructions but did not make a difference. The full alarm just came on as soon as I turned on the power at the circuit breaker panel. Any suggestion/help would be greatly appreciated as to how to silence this unnecessary alarm. We have one more of these smoke alarms, plus 3 combo ones to install upstairs. If this alarm doesn't go away, all 6 will have to go back to Home Depot. Thanks.
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Lebanon, IN
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August 10, 2015
Answer: 
This happened to me, I had a wire nut that was loose on the neutral wire and all the alarms sounded on AC power, I reconnected the wire after I found it and the problem stopped immediately. I have lost power in the house sense then and no alarm. I am sure that was the problem in my case.
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How often to the batteries need to be changed?

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August 16, 2016
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combination alarm

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Boscawen. NH
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December 14, 2015
Which combination alarm can be wired in the same circuit as this smoke alarm?? Want them to all play well together
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  • 2016-08-20 T13:04:46.690-05:00
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Customer Reviews

Rated 3.7 out of 5 by 53 reviewers.
Rated 1.0 out of 5.0 by If you like ear-splitting, panic-inducing false alarms in the wee hours, get these! Bought 12 of these, the photoelectric type, because they allegedly had fewer false alarms than the ionization type (same brand). Two days after installation (interconnected), ear-splitting false alarms due to one defective unit. Returned. Exchanged. Disgusted with this company. August 9, 2016
Rated 5.0 out of 5.0 by $ for $ a good buy This was a replacement to a 20 year old alarm, mounted up on old plate and same pig tail. Easy for me August 2, 2016
Rated 5.0 out of 5.0 by Nice Easy Installation Easy to install smoke detectors--puts our minds at ease. July 19, 2016
Rated 5.0 out of 5.0 by Kidde Smoke Detectors My home is 7 years old and it was time to replace the current Kidde smoke detectors. YES IT IS NECESSARY TO REPLACE THEM WHEN THEY START TO BEEP PERIODICALLY. What I like about the Kidde product is that they continue to use the same electrical connectors and mounting plates which makes the replacemtn quick and easy. June 28, 2016
Rated 4.0 out of 5.0 by good product easy install Easy to install. Works like a charm. Was replacing another smoke alarm which didn't sound loud enough, and this replacement even fit into the existing mount. June 28, 2016
Rated 1.0 out of 5.0 by Horrible junk I bought this alarm 1 year ago. It started going off, which set the other alarms off. It would sound for 10 seconds, then quit. It would do it about 10 times a day, every 4 hours. I replaced the batteries, vacuumed it, and blew it with compressed air, nothing worked. This is a horrible alarm. Do not buy this horrible junk June 21, 2016
Rated 4.0 out of 5.0 by Smoke alarm/hard wired w/battery backup Easy to install with the new electrical hookup- Price is right May 17, 2016
Rated 4.0 out of 5.0 by Upgraded to a better Unit Satisfied that installation was not a hassle, Previous detector, same manufacturer was a noisy problem. May 10, 2016
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