BRK First Alert 9120B Smoke Detector AC Powered Battery & Backup July 2017

Broad Sound Sales
(1211)
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US $20.00/ea
Condition:
Open box
5 available3 sold
Bulk savings quantity 1
Bulk savings:
Buy 4 or more for 18.8 each one

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People are checking this out. 5 have added this to their watchlist.
Popular item. 3 have already sold.
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Located in: Boston, Massachusetts, United States
Delivery:
Estimated between Tue, Oct 14 and Fri, Oct 17 to 94104
Delivery time is estimated using our proprietary method which is based on the buyer's proximity to the item location, the shipping service selected, the seller's shipping history, and other factors. Delivery times may vary, especially during peak periods.
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Seller does not accept returns.
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eBay item number:187301716248
Last updated on Jun 06, 2025 21:36:07 PDTView all revisionsView all revisions

Item specifics

Condition
Open box: An item in excellent, new condition with no wear. The item may be missing the original ...
Power Source
Battery, Hardwired
Color
White
Item Diameter
No
Year Manufactured
2017
MPN
9120B
Item Depth
2 in
Smart Home Compatibility
Amazon Alexa
Brand
BRK
Type
Smoke Alarm
Number of Batteries
1
Model
9120B
Features
Battery Backup
Country/Region of Manufacture
Mexico
Smart Home Protocol
Bluetooth, Powerline/UPB
Operating Sound Rating
1
Power
Smoke
Item Weight
1 pounds
Category

Item description from the seller

About this seller

Broad Sound Sales

99.8% positive feedback•4.1K items sold

Joined Jan 2010
Usually responds within 24 hours
Hello, we are focused on a great customer experience. We want you to be happy with our products. If you have any questions or concerns please let us know. We're here to help. Please save our store and ...
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Detailed seller ratings

Average for the last 12 months
Accurate description
4.9
Reasonable shipping cost
5.0
Shipping speed
5.0
Communication
5.0

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Seller feedback (1,218)

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  • u***p (80)- Feedback left by buyer.
    Past 6 months
    Verified purchase
    A great seller, and a smooth transaction. Carefully packaged and the item came as described. Great communication. I had concerns regarding the product and e-mailed the seller about those concerns. He immediately responded to make things right. The product was working fine all along however I was amazed at how fast the seller got back to me to make things right. Great seller, Perfect transaction, great value and perfect condition. I would buy from this seller again. Thanks.
    Kobalt 40v Max 600 psi Power Cleaner Kit Pressure Washer with Battery + Charger (#186907490669)
  • r***s (146)- Feedback left by buyer.
    Past 6 months
    Verified purchase
    Shipping was very prompt and quick, packaging was nicely packed in and professional keeping the product intact. The items were as described but had other complications. The seller worked with me and issued me a refund, I would buy from this seller again, highly recommend.
    Seagate Mobile HDD 1TB, Internal, 5400 RPM, 2.5" Hard Drive ST1000LM035 (#187344064935)
  • 8***4 (49)- Feedback left by buyer.
    Past month
    Verified purchase
    Postage fast package good as described good value. Great seller
    CROSS Fountain Pen Case Only With Accessories (#186879580676)
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Product ratings and reviews

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4.9
573 product ratings
  • 513 users rated this 5 out of 5 stars
  • 51 users rated this 4 out of 5 stars
  • 5 users rated this 3 out of 5 stars
  • 0 users rated this 2 out of 5 stars
  • 4 users rated this 1 out of 5 stars

Would recommend

Good value

Good quality

Most relevant reviews

See all 435 reviews
  • by jaglover6864
    Apr 13, 2021Top favorable review

    Great Smoke Alarm, FAST shipping

    Works well, good value. I have 12 smoke detectors in my house; a completely refurbished 1908 home. We were required to install fire detectors in all our rooms and the remodeler installed First Alert smoke alarms and all interconnected. They are all 8 years old and a starting to fail, one at a time. I want to replace them with like kind units, and eBay was the easiest place to purchase them. I have replaced the one bad unit with this one purchased from eBay and it is working fine The unit was very reasonably priced and shipping was FAST!!

    Verified purchase: YesCondition: New

  • by mightyeng
    Jul 21, 2020Top critical review

    Replacement detector

    The reason I bought this smoke detector is because it replaced an existing one that stopped working after six years. It just slotted right in without any modifications. The house builder installed this model and it has worked satisfactorily until now. My immediate reaction to this product was that it was all a bit flimsy. The battery compartment seemed weak and plastically. However, as I don’t intend to replace the whole unit by another product, it appears that the other alarms will likewise be replaced in time. I believe they are designed to last about ten years before the radioactive source is depleted.

    Verified purchase: YesCondition: NewSold by: worldus

  • by dbc7718
    Jul 06, 2021

    Great product and was easy to replaced the old ones.

    I bought these new smoke alarm detectors to replace my current ones that were 13 year old. One started to fail so I went ahead and bought 4 to replace them all. I was a bit concerned about replacements because what usually happens is it when you have an old model, that old model would be replaced is a new model but with a different design even though it looks the same when you see a picture of one online.. I was extremely pleased that my old model was still being made and I replaced them all very easily. The base plates were exactly the same and I did not have to do any rewiring. I took less than a minute to replace each one. So yes - I am extremely happy!

    Verified purchase: YesCondition: NewSold by: torch_lighting_and_electrical

  • by ashleyalw2009
    Jul 14, 2021

    Installed easily

    I needed to replace thirty year old smoke detectors in a manufactured home. These installed easily in place of the old ones. Just a few tools, and a knowledge of electrical connections and safety required. I love the fact that these also have a battery backup. The old ones did not have this option. You don't give a lot of thought to smoke detectors until you need one, or they fail. These seem to be good ones.

    Verified purchase: YesCondition: Pre-OwnedSold by: worldus

  • by riwe-4196
    Aug 04, 2021

    Great Value

    This is a direct replacement for the original units in my home. There was no need to change the mounting plate or the wiring harness. Yes there are new units that have a 10 year sealed battery, but the cost is higher. The common 9 Volt battery is very easy to replace once a year as recommended.

    Verified purchase: YesCondition: NewSold by: elementalexchange

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