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Model # 21007588

Internet # 202029423

Store SKU # 802605

120-Volt Hardwired Inter Connectable Smoke Alarm with Battery Backup (4-Pack)

This item has been discontinued.
The Home Depot no longer carries this specific product.

$54.00 / each



Model # 21007588

Internet # 202029423

Store SKU # 802605

The Walter Kidde Hardwire Smoke Alarms (4-Pack) alert you to potential fire dangers by detecting the presence of smoke and heat in the atmosphere. These alarms are equipped with 2 pre-stripped wires for easy installation and have a 9-Volt battery backup to ensure continued use during a power failure. The alarms feature a dust cover that protects the internal sensor from airborne contaminates that may take flight during a fire or a construction job.

  • Detects smoke and heat for reliable protection against fire
  • Hush alarm control button silences false alarms
  • Test button allows you to check functionality without sounding the full alarm
  • 9-Volt battery backup provides protection during power outages
  • Battery is easily accessible through the front pull tab
  • Pre-stripped wiring harness with easy-off cap ensures quick installation
  • Dust cover protects the sensor from contaminates
  • 4 detectors included (part # i4618)
  • 360˚ mounting bracket allows mounting from any angle

Info & Guides

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Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 
Alarm Sensor Type 
Alarm Type 
Alarm/Detector Features 
Battery Back-Up,Hush Feature,Interconnected,Value Pack 
Commercial / Residential 
Commercial / Residential 
Connector/Contact Type 
Power Source 
Voltage (volts) 
Warranty / Certifications
Certifications and Listings 
1-UL Listed 


Rated 4.2 out of 5 by 58 reviewers.
Rated 4.0 out of 5.0 by Easy to install These devices were easy to install. I replaced my old ones that were over 10 years old because one would go off randomly and set them all off. Since it is a life safety device it wasn't worth guessing just replaced all of the old ones with new. The installation is easy color to color splice, run in two screws, and snap it together. The test feature works, but can speak for how they work in an actual fire since I haven't had a fire. I'm not sure of the life expectancy, but given the age of the old one and it is a small price for piece of mind with a family. March 10, 2015
Rated 4.0 out of 5.0 by Great value - good detectors! The smoke detectors are great replacements for our old ones. The 4-pack is a great value, and enabled us to replace all the old detectors. June 25, 2015
Rated 4.0 out of 5.0 by great design Simple mounting hardware and electrical hook up with great look April 14, 2015
Rated 5.0 out of 5.0 by Good value, no unnecessary bells and whistles. So far so good Used two of these reasonably priced 4-packs to replace eight older Kidde alarms, since two of them had failed after about 7 years. Have 8 interconnect alarms in my home, so a false alarm in the middle of the night is not pleasant. Was able to use the existing AC quick connect wiring (Kidde/Firex standard) which cut down on replacement time. I like the new accessible battery compartment that doesn't require unmounting the alarm. After installation, all tested well interconnected, with hopefully no false alarms to come. The dust cover mentioned in the description is simply a "mini shower cap" the protects the alarm while building construction is in progress. You don't want to leave it on. March 20, 2012
Rated 1.0 out of 5.0 by EATS BATTERIES!! Out of the 4 Ive replaced all 4 batteries within 4 months of install, ALL 4! Of course each time was in the middle of the night, two are up very high on cathedral ceiling. Will be replacing these they have been awful. June 6, 2015
Rated 4.0 out of 5.0 by Easy installation even for a "girl" Replaced 4 very old smoke alarms. Even with my 9 ft ceilings, it took me about 5-7 minutes to install. Hope I never have to report how well they work. I trust the brand. June 7, 2015
Rated 5.0 out of 5.0 by Easy to install and replace old detectors. I had a bunch of old detectors (12 years old) to replace that were starting to become a nuisance with false alarms or not working at all. I replaced the old units with these, simple install and so far so good. I would get these ones again. June 2, 2015
Rated 5.0 out of 5.0 by Easy Replacement I replaced three 25+ year old smoke alarms using this product. They were relatively easy to install and wire up. The battery backup is an added feature I didn't previously have. I haven't yet had a nuisance alarm go off near the kitchen area where smoke from normal cooking occurs. I had disconnected the old smoke detector in that area many years ago for that reason. March 16, 2015
  • 2015-07-01T14:00:59.441-05:00
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