---
product_id: 72948431
title: "BRK SMI100-AC Hardwired Smoke Detector with Battery Backup, 6-Pack"
brand: "first alert"
price: "₱15200"
currency: PHP
in_stock: true
url: https://www.desertcart.ph/products/72948431-brk-smi100-ac-hardwired-smoke-detector-with-battery-backup-6
store_origin: PH
region: Philippines
---

# Loud 85dB alarm Battery backup for power outages Interconnect up to 18 units BRK SMI100-AC Hardwired Smoke Detector with Battery Backup, 6-Pack

**Brand:** first alert
**Price:** ₱15200
**Availability:** ✅ In Stock

## Summary

> 🔥 Stay ahead of danger with the smartest smoke alarms on the block! 🔥

## Quick Answers

- **What is this?** BRK SMI100-AC Hardwired Smoke Detector with Battery Backup, 6-Pack by first alert
- **How much does it cost?** ₱15200 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ph](https://www.desertcart.ph/products/72948431-brk-smi100-ac-hardwired-smoke-detector-with-battery-backup-6)

## 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

- • **Smart Silence & Test:** Single button to silence nuisance alarms or test functionality—effortless peace of mind.
- • **Uninterrupted Safety:** 120V hardwired with 9V battery backup ensures your home stays protected even during power failures.
- • **Seamless Connectivity:** Interconnect up to 18 devices so every corner of your home sounds the alarm simultaneously.
- • **Built to Last a Decade:** 10-year limited warranty with dust cover protection for long-term, maintenance-free reliability.
- • **Quick & Secure Installation:** Open mounting design with tamper-resistant locking pins and gasket-less base for flawless setup.

## Overview

The First Alert BRK 9120Bff-6 is a 6-pack of hardwired smoke detectors featuring 120V AC power with 9V battery backup, interconnectivity for up to 18 units, and a loud 85dB alarm. Designed for easy installation with tamper-resistant locking pins and a single-button silence/test function, these ionization sensor alarms reduce nuisance alerts and provide reliable, decade-long protection for your home.

## Description

First Alert BRK 9120Bff-6 Hardwired Smoke Detector with Battery Backup, 6-Pack

## Features

- 6 pack of hardwired smoke alarms, includes battery backup for power outages
- Tamper resistant locking pins, single button silence/test and loud 85Db alarm
- 120-Volt AC power with 9-volt battery backup (included) to keep alarm functioning during power outage
- Open mounting design for easy installation with side load battery compartment for quick replacement and interconnect able up to 18 units (12 smoke, 6 co/heat/relay)
- 10-Year limited
- Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | First Alert |
| Style | Hardwired |
| Power Source | Battery Powered |
| Color | White |
| Product Dimensions | 2.2"D x 5.6"W x 5.6"H |
| Item Weight | 9.6 ounces |
| Alarm | Audible |
| Operating Humidity | 10-95% RH |
| Sensor Type | Ionization |
| Number of Items | 6 |
| Manufacturer | First Alert |
| UPC | 029054019387 029054019226 |
| Part Number | 9120BFF-6 |
| Item model number | 9120BFF-6 |
| Batteries | 1 9V batteries required. (included) |
| Item Package Quantity | 1 |
| Certification | not_applicable |
| Included Components | 9-volt battery (6), First Alert BRK 9120B Hardwired Smoke Alarms with Battery Backup (6), Mounting brackets with hardware (6) |
| Batteries Included? | Yes |
| Batteries Required? | Yes |
| Battery Cell Type | Alkaline |

## Product Details

- **Brand:** First Alert
- **Style:** Hardwired
- **Power Source:** Battery Powered
- **Color:** White
- **Product Dimensions:** 2.2"D x 5.6"W x 5.6"H
- **Item Weight:** 9.6 ounces
- **Alarm:** Audible
- **Operating Humidity:** 10-95% RH
- **Sensor Type:** Ionization
- **Number of Items:** 6

## Images

![BRK SMI100-AC Hardwired Smoke Detector with Battery Backup, 6-Pack - Image 1](https://m.media-amazon.com/images/I/71P8xUZFBFL.jpg)

## Questions & Answers

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

**Q: Do these have to be wired in**
A: Ours were wired in

**Q: when is the espiration date?**
A: Thank you for your question. This unit has a 10 yr warranty that starts from the date of purchase.

**Q: can you put a ten year battery in this?**
A: I don't see why you couldn't. A 9 volt battery is a 9 volt battery..

## Frequently Bought Together

- First Alert BRK 9120Bff-6 Hardwired Smoke Detector with Battery Backup, 6-Pack
- BRK First Alert 9120BFF/ SMI100-AC Smoke Detector, Hardwired Alarm with Battery Backup, White, 1-Pack
- Amazon Basics 8-Pack 9V Alkaline Batteries, 5-Year Shelf Life - for Smoke/CO Detector, Electronics & Audio

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**Shop now:** [https://www.desertcart.ph/products/72948431-brk-smi100-ac-hardwired-smoke-detector-with-battery-backup-6](https://www.desertcart.ph/products/72948431-brk-smi100-ac-hardwired-smoke-detector-with-battery-backup-6)

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*Product available on Desertcart Philippines*
*Store origin: PH*
*Last updated: 2026-02-09*