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  Hazardous Code  No Air 
Included  Batteries  Power Source  Hardwired 
Returnable  90-Day  Voltage (volts)  120 
Warranty / Certifications
Certifications and Listings  1-UL Listed 


Rated 4 out of 5 by 1 reviewer.
Rated 4 out of 5 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
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