This item is out of stock.

Picture 1 of 6

Have one to sell?

Sell it yourself

BRK First Alert 9120B Smoke Detector AC Powered Battery & Back-Up MAY2024

Gazelle-Intensity

(1440)

Seller's other items

Contact seller

US $21.00

ApproximatelyAU $32.44

or Best Offer

Condition:

Brand New

Quantity:

Out of stock30 sold

Add to Watchlist

Postage:

Free USPS First Class®.

Located in: Miami, Florida, United States

Delivery:

Estimated between Thu, 7 Aug and Tue, 12 Aug to 94104

Returns:

No returns accepted.

Payments:

Shop with confidence

eBay Money Back Guarantee

Get the item you ordered or your money back. Learn moreeBay Money Back Guarantee - opens new window or tab

Seller assumes all responsibility for this listing.

eBay item number:176982659984

Last updated on 17 Jun, 2025 00:48:39 AESTView all revisionsView all revisions

Item specifics

Condition: Brand New: A brand-new, unused, unopened, undamaged item in its original packaging (where packaging ... Brand New: A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is applicable). Packaging should be the same as what is available in a retail store, unless the item was packaged by the manufacturer in non-retail packaging, such as an unprinted box or plastic bag. See the seller's listing for full details. See all condition definitionsopens in a new window or tab

Power Source: Battery, Hardwired

Color: White

Item Diameter: No

Year Manufactured: 2024

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

Item description from the seller

About this seller

Joined Sep 2020

Usually responds within 24 hours

Visit store Contact

Detailed seller ratings

Average for the last 12 months

Accurate description

4.8

Reasonable postage costs

4.8

Postage speed

5.0

Communication

5.0

Seller feedback (1,448)

This item (5)

All items (1,448)

a***r (38)- Feedback left by buyer.
Past month
Verified purchase
Exactly as described - new in box with long expiration date. More than reasonable price! Super fast communication and shipping from seller. Very much appreciated! One of the easiest transaction I've ever had on ebay.
4***l (296)- Feedback left by buyer.
Past 6 months
Verified purchase
Fast shipping and reasonable price
l***l (217)- Feedback left by buyer.
Past 6 months
Verified purchase
As described. Very fast shipment. Thanks for the deal!

See all feedback

Product ratings and reviews

Learn more

4.9

569 product ratings

510 users rated this 5 out of 5 stars
50 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 431 reviews

by jaglover6864
14 Apr, 2021Top favourable 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!!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
22 Jul, 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.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
07 Jul, 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!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
14 Jul, 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.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
04 Aug, 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

Picture 1 of 6

BRK First Alert 9120B Smoke Detector AC Powered Battery & Back-Up MAY2024

Shop with confidence

Item specifics

Item description from the seller

Gazelle-Intensity

98.5% positive Feedback•5.5K items sold

Detailed seller ratings

Seller feedback (1,448)

Product ratings and reviews

Most relevant reviews

Great Smoke Alarm, FAST shipping

Replacement detector

Great product and was easy to replaced the old ones.

Installed easily

Great Value

More to explore:

Gazelle-Intensity

98.5% positive Feedback•5.5K items sold

Detailed seller ratings

Seller feedback (1,448)