---
product_id: 2215214
title: "First Alert BRK SMI100-AC Hardwired Smoke Alarm with Battery Backup, Contractor 6-Pack"
brand: "first alert"
price: "₩287993"
currency: KRW
in_stock: true
reviews_count: 8
category: "First Alert"
url: https://www.desertcart.kr/products/2215214-first-alert-brk-smi100-ac-hardwired-smoke-alarm-with-battery
store_origin: KR
region: South Korea
---

# Interconnects with other alarms for full-home alert Battery backup for power outage safety Ionization sensor detects fast flaming fires First Alert BRK SMI100-AC Hardwired Smoke Alarm with Battery Backup, Contractor 6-Pack

**Brand:** first alert
**Price:** ₩287993
**Availability:** ✅ In Stock

## Summary

> 🔥 Stay ahead of danger with the most trusted 6-pack smoke alarm solution! 🔋

## Quick Answers

- **What is this?** First Alert BRK SMI100-AC Hardwired Smoke Alarm with Battery Backup, Contractor 6-Pack by first alert
- **How much does it cost?** ₩287993 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/2215214-first-alert-brk-smi100-ac-hardwired-smoke-alarm-with-battery)

## Best For

- first alert enthusiasts

## Why This Product

- Trusted first alert brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Rapid Fire Detection:** Advanced ionization sensor quickly identifies fast flaming fires, giving you crucial extra seconds.
- • **Seamless Connectivity:** Link up to compatible First Alert or BRK alarms so every corner of your home sounds the alert simultaneously.
- • **Uninterrupted Protection:** Hardwired with 9V battery backup ensures your home stays monitored even during power failures.
- • **Trusted Legacy & Safety Assurance:** UL-tested and backed by First Alert’s 65+ years of home safety expertise, with a 10-year warranty for peace of mind.
- • **Effortless Installation & Maintenance:** Universal mounting brackets and tamper-resistant locks make setup a breeze; side-load battery drawer means no dismounting for replacements.

## Overview

The First Alert BRK SMI100-AC 6-pack hardwired smoke alarms combine reliable ionization sensing with a 9V battery backup to ensure continuous fire detection even during outages. Designed for easy installation and interconnectivity, these alarms provide comprehensive home coverage with loud 85dB alerts and tamper-resistant features. UL-tested and backed by a decade-long warranty, this pack is a professional-grade safety upgrade trusted by contractors and homeowners alike.

## Description

Product Description This 6 pack of First Alert hardwired smoke alarms includes a 9 volt battery backup that continues to protect you in the event of a power failure. The detector features an ionization sensor for detection of smoke and fast flaming fires, as well as a loud, 85 decibel alarm. One button silences any nuisance alarms, and also tests detector functions, while lights indicate if the alarm detects smoke. The latching alarm indicator automatically identifies which unit initiated the alarm, even after the conditions that set off the alarm have subsided. And an end of life signal enhances your safety by letting you know when it's time to replace the unit. Connect it to compatible BRK or First Alert alarms within a single family residence. When one alarm is triggered, all connected alarms will sound. From the Manufacturer NOTE:The product is a hardwired alarm, also confirm if the wiring polarity is correct and that all wire nut connections are secure. A loose neutral (white wire) connection within the home junction box could prompt a device malfunction. First Alert 120 Volt Wire-In with Battery Backup smoke alarm in 6 pack contractor pack

Review: Simple installation, no issues - No issues! The is no sound when the alarm is not triggered. The running light isn't bright or flashing. These units weren't difficult to install and changing the batteries wont be difficult either. I haven't had them long and haven't tested them with smoke still can't speak to the sensitivity.
Review: Quality fire alarms - These fire alarms were very easy to install and work well.

## Features

- Note: A loose neutral (white wire) connection within the home junction box could prompt a device malfunction
- Equipped with an ionization sensor, this smoke alarm reliably detects smoke from fast flaming fires and alerts you with an 85 decibel alarm
- To ensure complete protection make sure to place one on each level of your home and in each bedroom
- Can connect to other compatible BRK or First Alert smoke detectors, to ensure all alarms will sound when smoke is detected
- Simple to use, with a single test/silence button, and side load battery compartment; Tamper resistant locking brackets and universal mounting brackets make installation easy
- Rigorously tested to meet UL standards. Emits T3 pattern
- Keep your family safe with this 6 pack of hardwired smoke alarms; the battery backup means constant monitoring, even if there's a power failure
- Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety. easy-to-access battery drawer that allows you to replace the battery without dismounting the alarm
- First Alert has been the most trusted brand in home safety since launching the first residential smoke alarm in 1958 (Based on a First Alert Brand Trust Survey in February 2018)

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000KKHWLU |
| Alarm | Audible |
| Batteries | 2 AA batteries required. (included) |
| Batteries Included? | Yes |
| Batteries Required? | Yes |
| Battery Cell Type | Zinc Carbon |
| Best Sellers Rank | #8,357 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #25 in Smoke Detectors & Fire Alarms |
| Brand | First Alert |
| Color | White |
| Customer Reviews | 4.7 4.7 out of 5 stars (11,612) |
| Date First Available | January 1, 2008 |
| Global Trade Identification Number | 00029054121134, 10029054121131 |
| Included Components | First Alert 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 6-Pack |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 3.34 pounds |
| Item model number | 9120B6CP |
| Manufacturer | First Alert |
| Material | Plastic |
| Number of Items | 6 |
| Operating Humidity | 10-95% RH |
| Part Number | 9120B6CP |
| Pattern | 9120B6CP |
| Power Source | Battery Powered |
| Product Dimensions | 1.9"D x 5.6"W x 5.6"H |
| Sensor Type | Ionization |
| Size | 6-Pack |
| Smart Home Compatibility | Not Smart Home Compatible |
| Style | Standard Detection |
| UPC | 111012470009 029054121134 |
| Voltage | 120 Volts |
| Warranty Description | 10 year |

## Product Details

- **Alarm:** Audible
- **Brand:** First Alert
- **Color:** White
- **Global Trade Identification Number:** 00029054121134, 10029054121131
- **Material:** Plastic
- **Operating Humidity:** 10-95% RH
- **Power Source:** Battery Powered
- **Product Dimensions:** 1.9"D x 5.6"W x 5.6"H
- **Sensor Type:** Ionization
- **Style:** Standard Detection

## Images

![First Alert BRK SMI100-AC Hardwired Smoke Alarm with Battery Backup, Contractor 6-Pack - Image 1](https://m.media-amazon.com/images/I/61gdjob8zBL.jpg)

## Questions & Answers

**Q: How do you silence this alarm? Apparently the low battery notification only starts after midnight and WILL NOT STOP unless you have another battery.**
A: I am certain this applies to all brand and model of smoke detectors.  Once the low battery beep starts happening, which is always just as your falling off to sleep, there is only one way to stop it.  Follow the steps outlined below.
1 - put all weapons in your house under lock and key. (this is for the safety of you your family and the manufacturer of the smoke detectors).
2 - Give the key to someone you can trust and that your are not capable of overpowering.
3 - Find the smoke detector that is beeping. Tip, its never the one you are standing beneath look up at.
4 - Ice your foot because by now you have kicked several walls, doors and furniture.
5 - Assuming you have located the guilty smoke detector and have not yet burned down your home or found a way to access your weapons in step 1, move to step 6.
6 - Take the guilty smoke detector(s) into the garage and smash them into as many pieces as possible with the biggest hammer you own.
7 - Most likely you have stopped the regular beeping but every 20 to 40 minutes or so you will still hear a beep.
8 - Start a fire in the back yard fire pit and when the fire has reached white hot with glowing red hot coals put the smashed bits and pieces into the fire and let it burn until it burns out on its own.
9 - Take a shower and get dressed because by this time your late for work and haven't slept.
10 - When you get home that evening and hear another beep burn the house but make it look like an accident.

**Q: Can a  BRK Model 92120B smoke detector directly plug in and replace an old BRK Model 4120B smoke detector (without an adapter)**
A: Yes.  I just replaced 2 very old (older than 10 years) BRK Electronics Model 4120B smoke detectors with these newer First Alert/BRK Brand Model 9120B units.  My older units were yellowed with age, so I also replaced the plastic base.  I did reuse the 3 pin electrical connector, as the "old" electrical connector matches the new unit.  The new smoke detectors are functioning/self-testing normally.

**Q: can these be connected together so if one is set off they  all go off?**
A: Have these in my home. House was built about 4 years ago (2017) Came with the house.. One goes off they all go off. They are connected to each other by wire. I did have the one in my bedroom that I had to replace prematurely.  It was just going off for no reason setting the entire house alarms. It was easily identified by the light on it that it was the culprit. Basic troubleshooting taking out of system all was good. I am a 42 year volunteer firefighter,  held a Chief, Captain , Luitenant, Firefighter and other various positions . My opinion,  having them all wired together, so when one goes off they all do is SMART! Been to multiple house fires through all my years and seen where the families on the first floor watching TV while their second floor or basement is burning up. 🔥

**Q: My entire home is equipped with BRK smoke detector (4120 B) and Carbon Monox Det (CO50120B). They need replacing. Will new BRK fit extant casings?**
A: The mount screws will fit but the base plate itself is slightly smaller and you might have to touch up paint. The connectors will fit as well so no need to change those

## Customer Reviews

### ⭐⭐⭐⭐⭐ Simple installation, no issues
*by J***S on February 21, 2026*

No issues! The is no sound when the alarm is not triggered. The running light isn't bright or flashing. These units weren't difficult to install and changing the batteries wont be difficult either. I haven't had them long and haven't tested them with smoke still can't speak to the sensitivity.

### ⭐⭐⭐⭐⭐ Quality fire alarms
*by M***C on December 14, 2025*

These fire alarms were very easy to install and work well.

### ⭐⭐⭐⭐⭐ Change it after 10 years or sooner if it misfires.
*by A***R on November 23, 2025*

The delivery was overnight and what a relief. These smoke detectors were spot on. We had our former smoke detectors for over 20 years and thought maintenance meant changing the battery and vacuuming any exterior dust particles. Nope, it means one should replace it at least every 15 years. HD and many hardware stores can't stock all the various types of smoke detectors. I looked up the original product number on the old smoke alarm and it was a perfect match. The only item that had to be changed was the base of the unit didn't match the previous one. Everything else worked perfectly. 1. Don't use a regular 9 volt, we purchased the Eveready long life and they generally last 5 years. Date the battery before you place it in the detector. 2. Date your detector on the outside, so you know when to replace it. 3. If you have a detector that is older than 10 years, definitely replace it. The MFG warranties it for 10 years. After that you are on your own. 4. When the weather changes for the winter, that is when the batteries and the back up system will blow in the middle of the night, generally after 430am. The price was right, 6 alarms for a little over $100 with shipping and tax. Do yourself a favor and replace the alarm after 10 years. The alarm company told me this or I would have just changed the battery and had the alarm go off again.

## Frequently Bought Together

- First Alert 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 6-Pack
- BRK First Alert 9120BFF/ SMI100-AC Smoke Detector, Hardwired Alarm with Battery Backup, White, 1-Pack
- Amazon Basics 8-Count 9 Volt Alkaline Performance All-Purpose Batteries, 5-Year Shelf Life, Packaging May Vary

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*Product available on Desertcart South Korea*
*Store origin: KR*
*Last updated: 2026-03-11*