---
product_id: 602345752
title: "First Alert SMI100, Battery-Operated Smoke Alarm, 2-Pack"
brand: "first alert"
price: "594 kr"
currency: DKK
in_stock: true
reviews_count: 13
category: "First Alert"
url: https://www.desertcart.dk/products/602345752-first-alert-smi100-battery-operated-smoke-alarm-2-pack
store_origin: DK
region: Denmark
---

# End-of-life warning Front-access battery Precision Detection tech First Alert SMI100, Battery-Operated Smoke Alarm, 2-Pack

**Brand:** first alert
**Price:** 594 kr
**Availability:** ✅ In Stock

## Summary

> 🚨 Stay safe, stay savvy — smoke detection that works as hard as you do!

## Quick Answers

- **What is this?** First Alert SMI100, Battery-Operated Smoke Alarm, 2-Pack by first alert
- **How much does it cost?** 594 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/602345752-first-alert-smi100-battery-operated-smoke-alarm-2-pack)

## 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

- • **End-of-Life Alert:** Smart warning signals when it’s time to replace the alarm, ensuring you’re never caught off guard.
- • **Easy DIY Installation:** Compact design fits existing mounts, letting you upgrade smoke safety without extra drilling or patching.
- • **Reliable Battery Included:** Comes with a 9V alkaline battery pre-installed, so you’re protected right out of the box.
- • **Effortless Battery Maintenance:** Front-access 9V battery compartment makes replacements quick and hassle-free—no ladder gymnastics required.
- • **Precision Detection Technology:** Advanced sensing reduces false alarms from cooking, so your peace of mind stays intact.

## Overview

The First Alert SMI100 is a 2-pack battery-operated smoke alarm featuring advanced Precision Detection technology to minimize nuisance alarms and provide early fire warnings. Designed for easy installation with front-access 9V battery compartments and end-of-life alerts, it ensures reliable, low-maintenance home safety. Trusted by thousands, it’s a top-rated choice for modern households prioritizing smart, hassle-free protection.

## Description

The First Alert SMI100 Battery-Operated Smoke Alarm is equipped with First Alert's Precision Detection advanced sensing technology and meets new industry standards. This battery-operated smoke alarm is easy to install and the front access battery compartment makes for easy battery replacements.

Review: Replaced Exp First Alert Smoke Detectors w/New - I just installed these 2 First Alert smoke detectors, so I can’t give you a long time use review, but I’m happy with my purchase. These replaced two 10 year-old similar First Alert smoke detectors that had reached their expiration date. I was very pleased with those, which is why I looked for the same smoke detectors. I couldn’t find the exact same ones, so I replaced with these, which look similar and are basic like the first pair. Although the size of the new ones are a little bit smaller than the ones they replaced, I was pleased to find that the new brackets fit the 2 screws I already had in the walls from the old ones. I was concerned that I would be patching and drilling, but I didn’t have to, so installation was easy peezy. The other thing that is different on the new ones is that the batteries are 9 V versus the AAs for the old ones. I prefer AAs because it’s a battery that I always have around the house and they are easy to come by and inexpensive, relatively speaking. However, the new detectors came with batteries, so I don’t have to worry about replacing them for another year.
Review: Good product - Easy to install & works very well

## 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
- Battery-operated alarm allows for easy installation and maintenance
- Front access battery compartment makes for easy battery replacements
- End-of-life warning lets you know when it’s time to replace the alarm
- Test/silence button for efficient testing to ensure alarm is working properly

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CJLN45JZ |
| Alarm | Smoke |
| Batteries | 1 9V batteries required. (included) |
| Batteries Included? | Yes |
| Batteries Required? | Yes |
| Battery Cell Type | Zinc Carbon |
| Best Sellers Rank | #53 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1 in Smoke Detectors & Fire Alarms |
| Brand | First Alert |
| Color | White |
| Customer Reviews | 4.5 4.5 out of 5 stars (23,150) |
| Date First Available | September 21, 2023 |
| Included Components | 9V Alkaline Battery |
| Item Package Quantity | 1 |
| Item Weight | 9.6 ounces |
| Item model number | SMI100 |
| Manufacturer | Resideo |
| Number of Items | 2 |
| Part Number | SMI100 |
| Pattern | SMI100 |
| Power Source | Battery Powered |
| Product Dimensions | 5.6 x 5.6 x 1.9 inches |
| Sensor Type | Ionization |
| Size | 2-Pack |
| Style | Precision Detection |
| UPC | 029054022400 |

## Product Details

- **Alarm:** Smoke
- **Brand:** First Alert
- **Color:** White
- **Item Weight:** 0.6 Pounds
- **Manufacturer:** Resideo
- **Number of Items:** 2
- **Power Source:** Battery Powered
- **Sensor Type:** Ionization
- **Style:** Precision Detection
- **UPC:** 029054022400

## Images

![First Alert SMI100, Battery-Operated Smoke Alarm, 2-Pack - Image 1](https://m.media-amazon.com/images/I/61G4T1kDyUL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Replaced Exp First Alert Smoke Detectors w/New
*by N***F on February 1, 2026*

I just installed these 2 First Alert smoke detectors, so I can’t give you a long time use review, but I’m happy with my purchase. These replaced two 10 year-old similar First Alert smoke detectors that had reached their expiration date. I was very pleased with those, which is why I looked for the same smoke detectors. I couldn’t find the exact same ones, so I replaced with these, which look similar and are basic like the first pair. Although the size of the new ones are a little bit smaller than the ones they replaced, I was pleased to find that the new brackets fit the 2 screws I already had in the walls from the old ones. I was concerned that I would be patching and drilling, but I didn’t have to, so installation was easy peezy. The other thing that is different on the new ones is that the batteries are 9 V versus the AAs for the old ones. I prefer AAs because it’s a battery that I always have around the house and they are easy to come by and inexpensive, relatively speaking. However, the new detectors came with batteries, so I don’t have to worry about replacing them for another year.

### ⭐⭐⭐⭐⭐ Good product
*by W***L on February 10, 2026*

Easy to install & works very well

### ⭐⭐⭐⭐⭐ These work so well, they know when I'm making toast
*by D***V on December 29, 2025*

Great value, high quality, function well - ask my toast how I know. They are loud enough to wake the dead, which is good because I am a heavy sleeper. They fit in the same frame as my old smoke detectors.

## Frequently Bought Together

- First Alert SMI100, Battery-Operated Smoke Alarm, 2-Pack
- Kidde Carbon Monoxide Detector, Battery Powered CO Alarm with LEDs, Test-Reset Button, Low Battery Indicator, Portable
- Amazon Basics 8-Pack 9V Alkaline Batteries, 5-Year Shelf Life - for Smoke/CO Detector, Electronics & Audio

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*Product available on Desertcart Denmark*
*Store origin: DK*
*Last updated: 2026-02-24*