---
product_id: 680932785
title: "First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup, 1-Pack"
brand: "first alert"
price: "S$73"
currency: SGD
in_stock: true
category: "First Alert"
url: https://www.desertcart.sg/products/680932785-first-alert-smi100-ac-hardwire-interconnect-smoke-alarm-with-battery
store_origin: SG
region: Singapore
---

# Hardwired with battery backup Interconnects all compatible alarms Quick Connect Plug for easy install First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup, 1-Pack

**Brand:** first alert
**Price:** S$73
**Availability:** ✅ In Stock

## Summary

> 🔥 Stay ahead of danger with smart, seamless smoke detection ⚡

## Quick Answers

- **What is this?** First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup, 1-Pack by first alert
- **How much does it cost?** S$73 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/680932785-first-alert-smi100-ac-hardwire-interconnect-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

- • **Trusted Reliability:** Solid build with 4.5-star rating and thousands of happy users
- • **Effortless Installation:** Quick Connect Plug means no rewiring headaches—upgrade in minutes
- • **Power Outage Protection:** Battery backup keeps you protected even when the power goes out
- • **Precision Detection Tech:** Reduces false alarms from cooking smoke for uninterrupted peace of mind
- • **Whole-Home Early Warning:** Interconnect feature ensures every alarm sounds simultaneously for maximum safety

## Overview

The First Alert SMI100-AC is a hardwired smoke alarm featuring advanced Precision Detection technology to minimize nuisance alarms, a battery backup for continuous protection during outages, and an interconnect system that triggers all compatible alarms simultaneously. Designed for easy installation with a Quick Connect Plug, it offers reliable, whole-home fire safety trusted by thousands.

## Description

First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup, 1-Pack : desertcart.ae: Tools & Home Improvement

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CJMN3443 |
| Alarm | Smoke Alarm |
| Best Sellers Rank | #179,930 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #185 in Smoke Alarms |
| Brand | First Alert |
| Built-In Media | Easy Adapter Plug, 9V Alkaline Battery |
| Color | White |
| Colour | White |
| Customer Reviews | 4.5 out of 5 stars 1,904 Reviews |
| Global Trade Identification Number | 10029054022469 |
| Item Dimensions D x W x H | 14.2D x 14.2W x 2.5H centimeters |
| Item Type Name | Smoke Alarm |
| Item Weight | 0.6 Pounds |
| Item weight | 0.6 Pounds |
| Manufacturer | Resideo |
| Mfr Part Number | SMI100-AC |
| Model Number | SMI100-AC |
| Number of Items | 1 |
| Power Source | Battery Powered |
| Power source | Battery Powered |
| Product Style | Precision Detection |
| Product dimensions | 14.2D x 14.2W x 2.5H centimeters |
| Sensor Type | Ionization |
| Style | Precision Detection |
| UPC | 029054022462 |
| Unit Count | 1 Count |

## Product Details

- **Brand:** First Alert
- **Colour:** White
- **Power source:** Battery Powered
- **Product dimensions:** 14.2D x 14.2W x 2.5H centimeters
- **Style:** Precision Detection

## Images

![First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup, 1-Pack - Image 1](https://m.media-amazon.com/images/I/61zYUADll+L.jpg)
![First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup, 1-Pack - Image 2](https://m.media-amazon.com/images/I/81fhp53OaDL.jpg)
![First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup, 1-Pack - Image 3](https://m.media-amazon.com/images/I/81KDJuyrITL.jpg)
![First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup, 1-Pack - Image 4](https://m.media-amazon.com/images/I/716JVl6-z-L.jpg)
![First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup, 1-Pack - Image 5](https://m.media-amazon.com/images/I/71D57xvrb1L.jpg)

## Available Options

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

## Frequently Bought Together

- First Alert SMI100-AC, 9120B Replacement Hardwire Interconnect Smoke Alarm with Battery Backup, 1-Pack
- First Alert SMICO100-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with Battery Backup, 1-Pack
- First Alert 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 6-Pack

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**Shop now:** [https://www.desertcart.sg/products/680932785-first-alert-smi100-ac-hardwire-interconnect-smoke-alarm-with-battery](https://www.desertcart.sg/products/680932785-first-alert-smi100-ac-hardwire-interconnect-smoke-alarm-with-battery)

---

*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-10-02*