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Model # 21009663

Internet # 203525026

Store SKU # 144239

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 Lithium-ion 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/day, seven days a week for a decade.

  • 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
  • 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
  • Unit activates when installed properly with bracket(included)
  • Ideal for living areas in the home
  • Available in a 3 pack

Info & Guides

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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 3.2 out of 5 by 88 reviewers.
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 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 great idea come with everything There's nothing worse than waking up to that pinging sound of a smoke detector batter alarm. It always happens when you're sleeping, and you can never identify the source easily. Well, here's the answer to that, a smoke detector with a 10 year battery. This is great, however, I'm not sure how I'll remember in 10 years to replace it, but whatever, we'll figure it out then. The nice thing about it is it comes with mounting screws and drywall anchors so you don't need any extra hardware to install one. December 29, 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 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 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 1.0 out of 5.0 by I'd rather have elective surgery than deal with this alarm one more time Look, the point of a smoke alarm is to be paranoid. It senses smoke, it makes noise, fine. Even when the smoke is "I'm making bacon". Sometimes you get false alarms, that's fine. The problem is that this alarm has one button. You'd expect that, when the alarm is going off, that button would tell the alarm "no, it's ok, he's just making bacon so shut up for a bit, huh?" What that button actually does is tell the alarm to make fun of you. Beep. Beep. *push* "Fire". "Hush mode deactivated"... what? "BEEP BEEP" *push* "BEEP BEEP" *push* "BEEP BEEP" It's lying on my kitchen floor now, finally silent. May 28, 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
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