Kidde Worry Free 10 Year Hardwired Smoke Alarm with Lithium Battery Back Up (3-Pack)-21010407-A at The Home Depot


Model # 21010407-A

Internet # 205422332

Store SKU # 1000392327

Worry Free 10 Year Hardwired Smoke Alarm with Lithium Battery Back Up (3-Pack)

Kidde Worry Free 10 Year Hardwired Smoke Alarm with Lithium Battery Back Up (3-Pack)

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

$79.97 / package


In Stock



Model # 21010407-A

Internet # 205422332

Store SKU # 1000392327

Kidde Worry Free Smoke Alarms protect your family for 10 years with a "sealed in" Lithium Ion Battery. 10 year Worry Free smoke alarms protect against tampering with a sealed in battery. 10 Year alarms provide an "End of Life" indicator at end of the product life alerting you to replace your smoke alarm.

  • 10 year "sealed-in" lithium back up battery
  • Tamperproof; cannot be disabled
  • Hardwired; interconnected
  • 10 year warranty
  • Interconnected

Info & Guides

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Alarm Sensor Type  Ionization  Alarm Type  Smoke 
Alarm/Detector Features  10-Year Battery,Battery Back-Up,Hush Feature,Interconnected,No Additional Features,Tamper Resistant  Assembled Depth (in.)  2 in 
Assembled Height (in.)  5 in  Assembled Width (in.)  5 in 
Certifications and Listings  1-UL Listed  Commercial / Residential  Commercial / Residential 
Connector/Contact Type  None  Included  Batteries 
Returnable  90-Day  Voltage (volts)  120 


Rated 4.4 out of 5 by 11 reviewers.
Rated 4 out of 5 by Easy to install I purchased these when they were on special. They replaced 18 year-old alarms because literature states that they should be replaced after 10 years. The units test fine but I don't know how they'll work in an actual emergency (I hope I never have to find out). As for quality, they appear to be fine but they're made in China so it's hard to know about quality control and an older lot of the same model number was recalled. If you purchase these be sure to register on Kidde's web site so that they can contact you if there's another recall. October 14, 2014
Rated 5 out of 5 by Great Smoke Detectors I have had other smoke detectors for 20 years in my home and all would beep at all hours of the night,whether they needed a new battery or not. So far so good with these. I like the idea of not changing any batteries and having my house safe from any possible fires. I think I made a great choice. November 11, 2014
Rated 5 out of 5 by Simple Connection The connections to the existing wiring for the units being replaced were the same as the existing units so it was a true "plug and play" installation. The one thing to note is that the trim ring to which the unit attaches is different from the one on the existing units, but not obviously so. The new rings must be used instead of simply attaching the new detectors to the old rings. November 4, 2014
Rated 4 out of 5 by smoke alarms Great product. Easy change out from the old smoke alarms. November 4, 2014
Rated 5 out of 5 by Smoke Alarm Easy install. replaced 15 year old smoke detectors . these fit in the same footprint so only took a few minutes. a great value on the one day sale . will be worth it if they dont start beeping in a few years, like the old style would do. October 28, 2014
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