---
product_id: 770784697
title: "First Alert BRK 3120B Hardwire Dual Photoelectric and Ionization Sensor Smoke Alarm with Battery Backup"
brand: "first alert"
price: "35080CFA"
currency: XOF
in_stock: false
url: https://www.desertcart.sn/products/770784697-first-alert-brk-3120b-hardwire-dual-photoelectric-and-ionization-sensor
store_origin: SN
region: Senegal
---

# Optipath 360° patented access 8760h battery life Dual photoelectric + ionization sensors First Alert BRK 3120B Hardwire Dual Photoelectric and Ionization Sensor Smoke Alarm with Battery Backup

**Brand:** first alert
**Price:** 35080CFA
**Availability:** ❌ Out of Stock

## Summary

> 🔥 Stay ahead of danger with 360° smart safety! 🔋

## Quick Answers

- **What is this?** First Alert BRK 3120B Hardwire Dual Photoelectric and Ionization Sensor Smoke Alarm with Battery Backup by first alert
- **How much does it cost?** 35080CFA with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.sn](https://www.desertcart.sn/products/770784697-first-alert-brk-3120b-hardwire-dual-photoelectric-and-ionization-sensor)

## 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 Alerts:** Dual latching indicators pinpoint low battery or alarm source instantly.
- • **Effortless Control:** One-button test and silence for monthly peace of mind and false alarm ease.
- • **Power When You Need It:** Hardwired with battery backup ensures nonstop protection, even during outages.
- • **360° Access Innovation:** Patented Optipath 360 design makes maintenance and monitoring a breeze.
- • **Unmatched Fire Detection:** Dual sensor tech covers all fire types for ultimate safety.

## Overview

The First Alert BRK 3120B is a hardwired smoke alarm featuring dual photoelectric and ionization sensors for comprehensive fire detection. It includes a battery backup with an impressive 8760-hour lifespan to maintain protection during power outages. The patented Optipath 360 technology allows easy access for testing and maintenance, while a single button simplifies monthly testing and silencing false alarms. Dual latching indicators provide clear alerts for low battery or alarm origin, making it a reliable and user-friendly safety device.

## Description

Shop First Alert BRK 3120B Hardwire Dual Photoelectric and Ionization Sensor Smoke Alarm with Battery Backup. Free delivery on eligible orders of £20 or more.

## Features

- Hardwired alarm includes battery backup for power outages
- Photoelectric and ionization sensors provide comprehensive fire detection
- A single button makes alarm easy to test monthly or silence during a false alarm
- Two latching features help indicate a low battery or the originating alarm in a system
- Optipath 360 patented technology provides 360 degrees of access to the smoke alarm

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00O8MVW44 |
| Average Battery Life | 8760 Hours |
| Batteries | 2 AA batteries required. (included) |
| Batteries Required? | Yes |
| Batteries included? | Yes |
| Date First Available | 3 Oct. 2014 |
| Item Package Quantity | 1 |
| Item Weight | 331 g |
| Item model number | 3120FF |
| Manufacturer | First Alert |
| Part Number | 3120FF |
| Power Source | Battery Powered, Corded Electric |
| Product Dimensions | 14.48 x 14.48 x 6.1 cm; 331.12 g |
| Style | Classic |

## Product Details

- **Alarm:** Visual
- **Brand:** First Alert
- **Global Trade Identification Number:** 00029054015334
- **Item weight:** 331 g
- **Manufacturer:** First Alert
- **Number of items:** 1
- **Power source:** Battery Powered, Corded Electric
- **Sensor type:** photoelectric
- **Style:** Classic
- **UPC:** 029054015334

## Images

![First Alert BRK 3120B Hardwire Dual Photoelectric and Ionization Sensor Smoke Alarm with Battery Backup - Image 1](https://m.media-amazon.com/images/I/31SH9nnrd0L.jpg)
![First Alert BRK 3120B Hardwire Dual Photoelectric and Ionization Sensor Smoke Alarm with Battery Backup - Image 2](https://m.media-amazon.com/images/I/41EwgQxwNLL.jpg)
![First Alert BRK 3120B Hardwire Dual Photoelectric and Ionization Sensor Smoke Alarm with Battery Backup - Image 3](https://m.media-amazon.com/images/I/41UIjxKy3OL.jpg)
![First Alert BRK 3120B Hardwire Dual Photoelectric and Ionization Sensor Smoke Alarm with Battery Backup - Image 4](https://m.media-amazon.com/images/I/41dkg4JEdKL.jpg)
![First Alert BRK 3120B Hardwire Dual Photoelectric and Ionization Sensor Smoke Alarm with Battery Backup - Image 5](https://m.media-amazon.com/images/I/51iXoozEccL.jpg)

## Questions & Answers

**Q: How does the Alarm Latch feature "easily identify initiating alarm"?  This is major problem with false alarms on my existing Kidde/Firex dual alarms.**
A: The unit that initiated the alarm will display a red light instead of green (while the others remain green). The same is true for the low battery latch - the unit with the low battery will flash green instead of having a steady green light. We had one unit (of 9) that kept false alarming when first installed, but we had just completed a renovation so may have been due to dust. It was nice to easily identify which unit initiated the alarm. No problems since replacing that one unit.

**Q: How do these units interconnect?  Hard wiring required?**
A: The unit alarms are connected via a fourth wire in the AC cable.  A three conductor cable with ground is the normal cable used ( likely 14/3 romex).  The white wire is the neutral, the black wire is 125 volt hot side, the bare copper wire is the ground wire and then there should be a red wire that is used to tie the alarms together.   The units are generally feed from a separate breaker.

**Q: My house has FireX FADC Ionization Detectors, Can I mix dual sensors detectors with them?**
A: Yes

**Q: Is this model interconnectible with the first alert SC9120b? Will these units communicate with each other?**
A: First Alert's manuals don't always list all the detectors they are compatible with.  I believe this 3120B is compatible with your 9120B.  Here's my logic:  1)  I have a 3120B and a 7010B.  They work together.  2)  I looked at the owner's manual for your 9120B on the BRK website.  It says the device works with the 7010B.  3)  If 9120B and 7010B work together and if 3120B & 7010B work together, then it follows that 9120B and 3120B should work together.  By the way, I used this same logic to determine that my 3120B and my 7010B would work together because they both worked with my older 4120B's and, sure enough, they did.You could always call BRK to confirm.Good luck!

## Frequently Bought Together

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*Product available on Desertcart Senegal*
*Store origin: SN*
*Last updated: 2026-02-16*