---
product_id: 680932785
title: "First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup, 1-Pack"
brand: "first alert"
price: "13309 kr"
currency: ISK
in_stock: true
reviews_count: 5
category: "First Alert"
url: https://www.desertcart.is/products/680932785-first-alert-smi100-ac-hardwire-interconnect-smoke-alarm-with-battery
store_origin: IS
region: Iceland
---

# 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:** 13309 kr
**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?** 13309 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/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

The First Alert SMI100-AC Hardwire Interconnect Smoke Alarm with Battery Backup meets new industry standards utilizing First Alert's Precision Detection advance sensing technology. This hardwire smoke alarm is easy to install and replace existing alarms with no need to rewire. Plus interconnect compatible alarms to create a whole home alarm system to help provide an early warning.

Review: Great Smoke Detectors - I was able to replace 7 old Firex smoke detectors with these using an adapter. I had to buy the adapters separately on desertcart. These were very easy to replace. I just unscrewed the old screws (not all the way, just enough to take off old base plate). These base plates fit perfect on the existing screws, so just tighten then down. I attached the adapters to the existing wires and then to the new smoke detector, screwed the new detector onto base plate, pulled out battery pull tab, tested and good to go. I bought 12 detectors in June 2026 and they were all manufactured on May 15, 2026 so I had no issue with any being years old as others have said. All detectors tested good (loud alarm, interconnected with no issue) and have had no false alarms. Overall great purchase!
Review: Far cheaper than the Canadian Kidde - Easy to replace the Kidde. Looks new and modern and is very easy to install especially if you're familiar with wire nuts and have some at home. If not, they're cheap at your hardware store. Use orange color wire nuts for the wires leading to the smoke alarm. Watch YouTube video on how they work. Very simple.

## Features

- First Alert's Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency.
- Through early warning interconnect, when one alarm sounds, all compatible alarms will sound
- Battery backup provides continuous protection during power outages
- Alarm indicator visually identifies the unit that initiated the alarm
- Quick Connect Plug included allows for easy installation with no need to rewire

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CJMN3443 |
| Alarm | Smoke Alarm |
| Best Sellers Rank | #191,731 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #210 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 2,016 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.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great Smoke Detectors
*by J***K on 5 July 2026*

I was able to replace 7 old Firex smoke detectors with these using an adapter. I had to buy the adapters separately on Amazon. These were very easy to replace. I just unscrewed the old screws (not all the way, just enough to take off old base plate). These base plates fit perfect on the existing screws, so just tighten then down. I attached the adapters to the existing wires and then to the new smoke detector, screwed the new detector onto base plate, pulled out battery pull tab, tested and good to go. I bought 12 detectors in June 2026 and they were all manufactured on May 15, 2026 so I had no issue with any being years old as others have said. All detectors tested good (loud alarm, interconnected with no issue) and have had no false alarms. Overall great purchase!

### ⭐⭐⭐⭐⭐ Far cheaper than the Canadian Kidde
*by S***E on 27 July 2025*

Easy to replace the Kidde. Looks new and modern and is very easy to install especially if you're familiar with wire nuts and have some at home. If not, they're cheap at your hardware store. Use orange color wire nuts for the wires leading to the smoke alarm. Watch YouTube video on how they work. Very simple.

### ⭐⭐⭐⭐⭐ Great value
*by T***A on 12 March 2026*

Great value

## 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.is/products/680932785-first-alert-smi100-ac-hardwire-interconnect-smoke-alarm-with-battery](https://www.desertcart.is/products/680932785-first-alert-smi100-ac-hardwire-interconnect-smoke-alarm-with-battery)

---

*Product available on Desertcart Iceland*
*Store origin: IS*
*Last updated: 2026-10-16*