Kidde Worry Free 10-Year Kitchen Sealed Lithium Battery Operated Combination Smoke and Carbon Monoxide Alarm-21009667 - The Home Depot


Model # 21009667

Internet # 203525030

Store SKU # 146429

Worry Free 10-Year Kitchen Sealed Lithium Battery Operated Combination Smoke and Carbon Monoxide Alarm

Kidde Worry Free 10-Year Kitchen Sealed Lithium Battery Operated Combination Smoke and Carbon Monoxide Alarm

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

$49.97 / each
  • Maintenance free
  • No batteries to buy and replace for this alarm
  • Combination smoke alarm


Model # 21009667

Internet # 203525030

Store SKU # 146429

Store SO SKU # 198092

Kidde 10 year Smoke Alarm is powered by sealed, long-life lithium batteries for ten years (the life of the alarm), meaning the alarm is always on. This alarm is ideal for the kitchen. This Ten Year Alarm is a combination smoke and carbon monoxide. The alarm features a unique sensor algorithm that detects real fires faster and reduces nuisance alarms. With a sealed, long-life lithium battery smoke and carbon monoxide combination alarm installed in your kitchen, you can enjoy peace of mind knowing your kitchen smoke alarm is always on; 24 hours per day, seven days a week for a decade.

  • Kidde 10 year kitchen combination smoke and carbon monoxide alarm is maintenance-free; never replace a battery during the alarm's operating life, in addition to the benefit of maintenance free, batteries are sealed, no need to worry about them being removed
  • Goodbye late night low battery chirps, an end-of-life signal tells you when it is time to replace the alarm unit, end of life signal chirps every 30-45 seconds when alarm needs replaced
  • Money savings, no batteries to buy and replace every six months, save up to $40.00 over the life of the alarm
  • Alarm is equipped with test - reset button, tests the circuitry and horn and resets memory after alarm has sounded
  • Alarm is UL listed and is equipped with a piezoelectric horn that is rated at 85 decibels at 10 ft.
  • Alarm is UL listed and is equipped with a piezoelectric horn that is rated at 85 decibels at 10 ft.

Info & Guides

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Product Depth (in.)  1.55  Product Height (in.)  5.6 
Product Width (in.)  5.6 
Alarm Sensor Type  Photoelectric  Alarm Type  Carbon Monoxide,Smoke 
Alarm/Detector Features  10-Year Battery,Hush Feature,Tamper Resistant  Commercial / Residential  Commercial / Residential 
Connector/Contact Type  None  Included  Batteries 
Power Source  Battery  Returnable  90-Day 
Voltage (volts) 
Warranty / Certifications
Certifications and Listings  1-UL Listed 


Rated 4.0 out of 5 by 64 reviewers.
Rated 4.0 out of 5.0 by Kitchen fume resistant The mounting ring on this unit is strange, only about the size of a USA 50 cent piece. (See attached photo of similar unit with same mounting system.) So they tried something different by having two different ways to mount it, one with traditional screws and anchors, and the other with a central drywall anchor screw. Neither gives me much confidence. To activate the unit, you have to give it a hard twist on the mounting system, and it felt like I was going to rip it right off the ceiling. I really would prefer a different, more traditional mounting system. Mounting issues aside, this unit is full of features. CO detection and kitchen fume resistance were why I got this unit. We have wired detectors in our house of ionization type, so the fact that this unit is photo-electric is a perfect complement for our kitchen area. The unit has passed our "broiler test" with flying colors. No more fanning the fumes from the detector. It can handle a few broiler fumes, no problem. I can't speak for the CO element. That's something I hope to never test. It is comforting to have as a second CO unit in our house. July 6, 2014
Rated 5.0 out of 5.0 by No Battey-change smoke detector Very unique and at the same time advantageous. What is better than a smoke detector that has a battery that lasts 10 years, also the time that the sensor lasts in any detector. Ingenious. I placed one directly outside the furnace room, outside my son's bedroom. June 17, 2014
Rated 1.0 out of 5.0 by DO NOT BUY!!! We bought two of these detectors only 8 weeks ago. We had one of the alarms start beeping indicating there was a Smoke Alarm. However, there was NO smoke and NO fire. The Hush button did not work so the alarm continued to go off for the next 1 1/2 hours. Finally, we had to turn the OFF screw which means the detector is no longer useable! It is suddenly a paperweight! This caused me to look at the second detector. It was then I noticed that one suddenly doesn't work! You have to be kidding me! After looking at others reviews on line this is par for the course for this make/model. What kind of company sells garbage like this when families are expecting this product to protect their lives? We will never buy another product from Kiddie. Second, we feel let down by Home Depot for selling such junk! September 5, 2014
Rated 5.0 out of 5.0 by Outstanding Alarm Have been operating very well, went off for a few seconds once when I got some oil to hot in fry pan, shut off when air cleared, so great alarm I can depend on and don't have to worry about changing battery every year. Love it February 18, 2015
Rated 1.0 out of 5.0 by Failed After four months the alarm went off at 2AM. There was no fire and the hush button didnt work. Turned off screw on back to silence and now detector is useless. October 9, 2014
Rated 1.0 out of 5.0 by Awful Same story as a lot of others here - installed it, about 6 months later, just starts going off in the middle of the day, can't hush, had to disable permanently using the screw. April 12, 2015
Rated 2.0 out of 5.0 by Expect False Alarms I purchased this product 6 months ago and installed it close to the furnace. The smoke alarm went off, it turns out that dust or insects can activate the receptors on the alarm. I tested the alarm and then removed it from the area to further test it, finally deactivated it to stop the alarm. Using pressured air to clean any dust/insects before deactivating is recommended by the manufacturer. Kidde is shipping a replacement alarm, without any question, within 7-10 business days. March 26, 2015
Rated 1.0 out of 5.0 by Lump of junk I purchased three of these, one for each floor of my home. Just now the one on the top floor started alarming, indicating a fire. This would be all well and good if the other smoke detector in the same room went off, as well. It didn't. After an hour of checking vents, furnace, stove, and moving different detectors to different rooms, I determined this one was a lemon. DO NOT WASTE THE $50. READ THIS AND THE OTHER REVIEWS. THIS DETECTOR IS JUNK! March 20, 2015
  • 2015-04-18T11:04:24.065-05:00
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