Kidde Worry Free 120-Volt Hardwire Interconnectable Smoke Alarm with 10-Year Battery Backup-21010407-A - The Home Depot


Model # 21010407-A

Internet # 205422307

Store SKU # 1000392327

Worry Free 120-Volt Hardwire Interconnectable Smoke Alarm with 10-Year Battery Backup

Kidde Worry Free 120-Volt Hardwire Interconnectable Smoke Alarm with 10-Year Battery Backup

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

$27.97 / each


Model # 21010407-A

Internet # 205422307

Store SKU # 1000392327

Kidde Worry Free Smoke Alarms protect your family for 10 years with a "sealed in" Lithium Ion Battery back up. 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 battery back up
  • Tamper-resistent; cannot be disabled
  • 10 year limited Warranty
  • 120 volt hardwired
  • Interconnected

Info & Guides

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Assembled Depth (in.)  1.75 in  Assembled Height (in.)  5.5 in 
Assembled Width (in.)  5.5 in 
Alarm Sensor Type  Ionization  Alarm Type  Smoke 
Alarm/Detector Features  10-Year Battery,Battery Back-Up,Hush Feature,Interconnected,No Additional Features,Tamper Resistant  Commercial / Residential  Commercial / Residential 
Connector/Contact Type  None  Included  Batteries 
Power Source  Hardwired  Returnable  90-Day 
Voltage (volts)  120 
Warranty / Certifications
Certifications and Listings  1-UL Listed 


Rated 4.4 out of 5 by 19 reviewers.
Rated 4.0 out of 5.0 by Where there is no smoke - why is there an alarm? Okay - like most I purchased these to replace old dated detectors that were yellow or chirping or whatever reason. I have not had these that long - 4 months. I have read a lot of reviews that stated that the alarm was chirping for no reason - and it is nearly new - only way to hush them is to effectively disable them from any future use. Welllll.... not so fast, Although new - mine went off too - they are interconnected so all were involved (even the old ones that I had not replaced yet). But I also remembered that I had done some drywall work (albeit in the garage). It is a little known fact that dust (yes dust) collected in the detector can in fact give a false positive (especially in photoelectric types). The solution for me was get out the vacuum with soft brush and clean the detectors. It took me until the 4th one (which was closest to the garage btw) where when I cleaned it - shhhhhhhhhhhh the alarm stopped! So if your alarms are chirping and they are not approaching their end of life "chirps of death" telling us the sensors are past their useful life - just clean the things with your vacuum - and that might be all there is to it. If they are interconnected it could be ANY of the detectors that require cleaning. October 9, 2014
Rated 5.0 out of 5.0 by Smoke Alarms The WORRY FREE 120-VOLT HARDWIRE INTERCONNECTABLE SMOKE ALARM WITH 10-YEAR BATTERY BACKUP installed easily and were the exact same size as the old ones so no new painting was required. We chose to use two smoke alarms and one smoke/CO combo, all wired together. I think this is a great idea to have a ten year battery/smoke detector so twice yearly one does not need to remember to replace batteries! Also, the cost may be more for these type but once you figure in the cost of 9 volt batteries and replacing all of them twice a year, the costs even out! January 20, 2015
Rated 4.0 out of 5.0 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 5.0 out of 5.0 by Great smoke alarms Purchased these for a client to replace old smoke alarms that kept going off for no reason. They were easy to install, look nice and have a hush button. Highly recommend. February 10, 2015
Rated 5.0 out of 5.0 by Great The product was easy to install and is working great. February 3, 2015
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