Kidde Worry Free 10-Year Living Area Sealed Lithium Battery Operated Smoke Alarm-21009663 - The Home Depot
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Model # 21009663

Internet # 203525026

Store SKU # 144239

Worry Free 10-Year Living Area Sealed Lithium Battery Operated Smoke Alarm

Kidde Worry Free 10-Year Living Area Sealed Lithium Battery Operated Smoke Alarm

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

$24.97 / each


Model # 21009663

Internet # 203525026

Store SKU # 144239

Store SO SKU # 198092

Kidde battery operated 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 Smoke Alarm is ideal for the living area. With a sealed, long-life Lithium Battery Smoke Alarm, you can enjoy peace of mind knowing your living area Smoke Alarm is always on; 24 hours per day, seven days a week for a decade.

  • Kidde 10 year living area smoke 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.

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Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 
Alarm Sensor Type 
Alarm Type 
Alarm/Detector Features 
10-Year Battery,Hush Feature,Tamper Resistant 
Commercial / Residential 
Commercial / Residential 
Connector/Contact Type 
Power Source 
Voltage (volts) 
Warranty / Certifications
Certifications and Listings 
1-UL Listed 


Rated 3.3 out of 5 by 80 reviewers.
Rated 1.0 out of 5.0 by if you like false alarms waking your children at 3 am this is perfect! i have 2 of these and they both go off at random. and it seems to be always at night. so they always wake up my kids. cool that the battery last 10 years.. but the housing doesnt stand up to my sledge after the 3rd time waking my kids for no reason. December 16, 2014
Rated 5.0 out of 5.0 by Battery replacement in a time capsule! Easiest smoke detector installed in minutes. Small round mounting bracket make life easy to center. The unit is the same size as my previous units. The unit has a label on the outside rim for install date and replacement dates. Unit turned on when clicked into place and installed correctly. October 22, 2014
Rated 5.0 out of 5.0 by Install it, forget it! With a 10-year battery, I shouldn't have to grab my ladder to check or change the batteries on a regular basis. Despite the oddly designed instruction sheet, the smoke detector is easy to install. Just screw the mounting plate to the ceiling or wall, then twist the smoke detector onto the mounting plate. That action will turn the unit on. After about 10 seconds, the unit will give out two beeps, twice. There is a test button in the middle that you can press from time to time to ensure functionality. I'll give it five stars for now; we'll see if it really lasts 10 years. August 21, 2014
Rated 1.0 out of 5.0 by BEEP! BEEP! fire (whisper) for hours This has to be the worst fire alarm ever. I was seduced by the 10 year battery, but I got 1 year out of this before it started going off repeatedly. Nothing makes it stop. The hush button gives you a glorious 10 minutes before it starts screeching again. Up till 2 am last night trying to get it to stop. Which it did until 6 am. Finally brought it to bed next to the humidifier, which kept it quiet. Going back to Home Depot today to get a real smoke alarm with accessible battery. The beeps are nice and loud, but it literally whispers "fire." April 13, 2015
Rated 1.0 out of 5.0 by Do not buy Had mine 6mo. alarm sounded for no reason, Reported it to Kidde they replaced it. Received 10/17/14 alarm sounded for no reason on 11/26/14 Once the alarm sounds and you turn it off YOU CANNOT TURN IT BACK ON YOU MUST THROW IT AWAY OR REPACE IT. November 26, 2014
Rated 1.0 out of 5.0 by Battery Failed after 5 months! Beware that many people rating this as 5 star due to the ten year battery most likely just purchased the alarm and haven't had it long enough to fail. My unit was fine for five months and then started with the end of life chirping. I see many other reviews with the same issue. Nothing will stop the chirping except turning the screw slot on the back which permanently disables the unit. I figured after 5 month that HD would not take it back, so I sent it back to Kidde for repair or replacement and am now without a detector in that one room. I'm going back to 9V battery models after this. June 30, 2014
Rated 5.0 out of 5.0 by Much Needed Alarm I was very happy to get this smoke alarm. I have a small office in an area that is not covered by any other smoke alarm. If there was ever a fire near my office, but not near the other alarm, it may be too late for me. This alarm has a 10 year lithium battery that is sealed in the unit. It is good to know that I wont have to worry about the battery change every year. October 23, 2014
Rated 1.0 out of 5.0 by I would not purchase again I purchased one and regret it. The mounting is really bad and the alarm won't turn on unless mounted. It's hard to get it mounted correctly. I took the mount down and connected it to the alarm and now can't get it out. I am amazed at the poor product design. I can imagine a lot of these get returned because the mount gets stuck on the alarm. I wouldn't buy this again and am returning it. October 15, 2014
  • 2015-05-02T11:03:13.434-05:00
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