I have 9120b detectors in my house now. I see these are 9120bff. Do you know what the difference is and will they work?

I don't see a difference that would cause a problem with them communicating with each other. They also look the same. Not sure if this helps, good luck

when is the espiration date?

Thank you for your question. This unit has a 10 yr warranty that starts from the date of purchase.

can you put a ten year battery in this?

I don't see why you couldn't. A 9 volt battery is a 9 volt battery..

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First Alert BRK SMI100-AC Hardwired Smoke Detector with Battery Backup, 6-Pack

First Alert BRK SMI100-AC Hardwired Smoke Detector with Battery Backup, 6-Pack

Product ID: 72948431

Details

Alarm
Audible
Brand
First Alert
Color
White
Compatible Devices
smoke alarms
Item Weight
9.6 ounces
Operating Humidity
10-95% RH

🔋9V battery backup for power outages

🔗Interconnect up to 18 units for full home coverage

🔧Open mounting design for quick, hassle-free install

₨4739

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Sold byAmazon SeychellesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔥 Stay ahead of danger with the smartest, fastest-install smoke alarms! 🔥

SMART SILENCE TEST - Single button to silence nuisance alarms or test functionality—control at your fingertips.
UNINTERRUPTED SAFETY - 120V hardwired power with 9V battery backup keeps you protected even during outages.
BUILT TO LAST A DECADE - 10-year limited warranty ensures long-term reliability and worry-free protection.
EFFORTLESS INSTALLATION - Open mounting design and gasket-less base make setup a breeze, saving you valuable time.
SEAMLESS HOME INTEGRATION - Interconnect up to 18 alarms and devices—when one sounds, all alert for total peace of mind.

The First Alert BRK SMI100-AC 6-pack hardwired smoke detectors combine 120V AC power with 9V battery backup to ensure continuous protection. Featuring ionization sensors for fast flaming fire detection, these alarms interconnect up to 18 units for whole-home coverage. Designed for quick installation with tamper-resistant locking pins and a single-button silence/test function, they deliver reliable, maintenance-free safety backed by a 10-year limited warranty.

Specifications

ASIN	B07B4CGQLT
Alarm	Audible
Best Sellers Rank	#2,925 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #17 in Smoke Detectors & Fire Alarms
Brand	First Alert
Built-In Media	9-volt battery (6), First Alert BRK 9120B Hardwired Smoke Alarms with Battery Backup (6), Mounting brackets with hardware (6)
Color	White
Compatible Devices	smoke alarms
Customer Reviews	4.6 4.6 out of 5 stars (1,249)
Item Dimensions D x W x H	2.2"D x 5.6"W x 5.6"H
Item Type Name	Smoke Detectors
Item Weight	9.6 ounces
Manufacturer	First Alert
Mfr Part Number	9120BFF-6
Model Number	9120B
Number of Items	6
Operating Humidity	10-95% RH
Power Source	Battery Powered
Product Style	Hardwired
Sensor Type	Ionization
UPC	029054019387 029054019226
Unit Count	6 Count

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TrustScore 4.5 | 7,300+ reviews

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Smooth transaction and product arrived in perfect condition.

3 weeks ago

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The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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₨4739

Duties & taxes included

In stock

Sold byAmazon SeychellesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Seychelles.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

Farhan Q.

The delivery time was excellent, and the packaging was secure.

2 months ago

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