---
product_id: 394173127
title: "SC9120B Corded Electric Combination Alarm with Adapter Plugs for Easy Replacement"
brand: "first alert"
price: "8108109₫"
currency: VND
in_stock: true
url: https://www.desertcart.vn/products/394173127-sc9120b-corded-electric-combination-alarm-with-adapter-plugs-for-easy
store_origin: VN
region: Vietnam
---

# 85dB loud alarm siren 10-year battery backup Adapter plugs for easy retrofit SC9120B Corded Electric Combination Alarm with Adapter Plugs for Easy Replacement

**Brand:** first alert
**Price:** 8108109₫
**Availability:** ✅ In Stock

## Summary

> 🏠 Stay ahead of danger with smart, seamless safety that lasts a decade!

## Quick Answers

- **What is this?** SC9120B Corded Electric Combination Alarm with Adapter Plugs for Easy Replacement by first alert
- **How much does it cost?** 8108109₫ with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/394173127-sc9120b-corded-electric-combination-alarm-with-adapter-plugs-for-easy)

## 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

- • **Effortless Upgrade:** Adapter plugs and quick-connect wiring mean no rewiring headaches—swap alarms in minutes.
- • **End-of-Life Signal:** Know exactly when to replace your alarm—no guesswork, just continuous safety assurance.
- • **Smart Sensing Tech:** Electrochemical CO sensor plus intelligent smoke detection reduces false alarms for hassle-free safety.
- • **Decade-Long Peace of Mind:** Built-in 10-year lithium battery backup ensures nonstop protection, even during power outages.
- • **Clear Alerts, Instant Action:** 85-decibel siren and indicator lights pinpoint danger fast, keeping your home and loved ones secure.

## Overview

The FIRST ALERT SC9120B is a hardwired combination smoke and carbon monoxide alarm featuring adapter plugs for easy replacement without rewiring. It includes a 10-year lithium battery backup for uninterrupted monitoring, electrochemical CO sensing, and intelligent smoke detection technology to minimize false alarms. With an 85dB siren, clear indicator lights, a single test/silence button, and an end-of-life signal, it offers reliable, long-term home safety backed by UL standards and a 10-year limited warranty.

## Description

This First Alert hardwired smoke alarm and carbon monoxide detector features an ionization smoke sensing chamber and an electrochemical carbon monoxide sensor. Installation and connection to AC power is easy with the included adapter plugs and "quick-connect" wiring harness so you can you easily replace existing hardwired alarms without needing to rewire. The 10-year battery backup allows for continued monitoring for the life of the alarm. Intelligent sensing technology is designed to reduce nuisance alarms; one button silences them if they do occur, and also tests detector functions. The latching alarm indicator automatically identifies which unit initiated the alarm, even after the conditions that set it off 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; connecting will sound all the alarms together.

## Features

- Convenient adapter plugs makes it easy to replace existing hardwired alarms without needing to rewire
- Keep your family safe with this hardwired First Alert smoke and carbon monoxide alarm with a 10-year battery backup, which means constant monitoring for the life of the alarm, even if there's a power failure
- Combination smoke alarm and carbon monoxide detector features electrochemical carbon monoxide sensing technology, as well as intelligent smoke sensing technology to reduce nuisance alarms
- Indicator lights on the face of the unit display the presence of smoke or carbon monoxide, while an 85-decibel siren provides a clear, loud warning upon detection
- Simple to use, with a single test/silence button; includes 10-year lithium battery with a locked drawer to prevent tampering.10-year limited warranty; equipped with end-of-life signal, so you know when it's time to replace the unit for your safety.Rigorously tested to meet UL standards.To ensure complete protection make sure to place one carbon monoxide detector on each level of your home and in each bedroom

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | First Alert |
| Power Source | Corded Electric |
| Color | white |
| Product Dimensions | 0.07"D x 0.22"W x 0.22"H |
| Item Weight | 0.63 Pounds |
| Alarm | Audible |
| Sensor Type | Electrochemical |
| Global Trade Identification Number | 00029054018786 |
| Material | Plastic |
| Number of Items | 1 |
| Manufacturer | First Alert |
| Style | Hardwired |
| UPC | 029054018786 |
| Part Number | 1039807 |
| Item Weight | 10.1 ounces |
| Item model number | SC9120B |
| Batteries | 1 Lithium Metal batteries required. (included) |
| Is Discontinued By Manufacturer | No |
| Size | No Size |
| Pattern | Alarm |
| Shape | Triangle |
| Item Package Quantity | 1 |
| Included Components | Alarm, Battery |
| Batteries Included? | Yes |
| Batteries Required? | Yes |
| Battery Cell Type | Lithium Metal |
| Warranty Description | Warranty |

## Product Details

- **Brand:** First Alert
- **Style:** 10-Year Battery Backup Replacement Alarm
- **Power source:** Battery Powered, Corded Electric
- **Colour:** red
- **Item weight:** 286 g

## Images

![SC9120B Corded Electric Combination Alarm with Adapter Plugs for Easy Replacement - Image 1](https://m.media-amazon.com/images/I/71tXFGPT0PL.jpg)

## Available Options

This product comes in different **Pattern Name, Style** options.

## Frequently Bought Together

- FIRST ALERT SC9120B Corded Electric Combination Alarm with Adapter Plugs for Easy Replacement
- Amazon Basics 8-Pack 9V Alkaline Batteries, 5-Year Shelf Life - for Smoke/CO Detector, Electronics & Audio
- First Alert BRK SC-9120B Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup

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*Product available on Desertcart Vietnam*
*Store origin: VN*
*Last updated: 2026-01-28*