---
product_id: 781714597
title: "First Alert SMI105-AC, Interconnect Hardwire Smoke Alarm with 10-Year Battery Backup, 1-Pack"
brand: "first alert"
price: "€ 151.16"
currency: EUR
in_stock: false
reviews_count: 5
category: "First Alert"
url: https://www.desertcart.nl/products/781714597-first-alert-smi105-ac-interconnect-hardwire-smoke-alarm-with-10
store_origin: NL
region: Netherlands
---

# Interconnects multiple alarms 10-year battery backup Precision Detection tech First Alert SMI105-AC, Interconnect Hardwire Smoke Alarm with 10-Year Battery Backup, 1-Pack

**Brand:** first alert
**Price:** € 151.16
**Availability:** ❌ Out of Stock

## Summary

> 🔥 Stay ahead of danger with smart, seamless fire protection!

## Quick Answers

- **What is this?** First Alert SMI105-AC, Interconnect Hardwire Smoke Alarm with 10-Year Battery Backup, 1-Pack by first alert
- **How much does it cost?** € 151.16 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.nl](https://www.desertcart.nl/products/781714597-first-alert-smi105-ac-interconnect-hardwire-smoke-alarm-with-10)

## 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:** Know exactly when it’s time to replace your alarm—no guesswork, no downtime.
- • **Visual Alarm Indicator:** Easily identify which unit triggered the alarm with a clear visual signal.
- • **Smart Home Fire Network:** Interconnect multiple alarms so when one sounds, all alert—early warning for your entire home.
- • **Precision Detection Technology:** Advanced sensing reduces false alarms from cooking while delivering rapid fire alerts.
- • **Uninterrupted Safety, Guaranteed:** 10-year battery backup ensures continuous protection even during power outages.

## Overview

The First Alert SMI105-AC is a hardwired smoke alarm featuring advanced Precision Detection technology that minimizes nuisance alarms and provides early fire warnings. It includes a 10-year battery backup for uninterrupted safety during outages and can interconnect with compatible alarms to alert your entire home simultaneously. With visual alarm indicators and end-of-life warnings, it offers reliable, long-term fire protection designed for modern households.

## Description

The First Alert SMI105-AC Interconnect Hardwire Smoke Alarm with 10-Year Battery Backup uses First Alert's Precision Detection advanced sensing technology and meets new industry standards. Interconnect multiple alarms together to help provide an early warning throughout your whole home and have peace of mind knowing the 10-year battery backup provides continuous protection in the event of a power outage.

Review: Bought this smoke detector because, you know, fire safety is important… Apparently not important enough for me to install it in under 90 days. But hey — I had other things to do. Like reorganize the garage. Twice. And stare at it in the box on the kitchen counter like it was going to mount itself. Meanwhile, my wife spent three months walking past it like she was in a house made of dry hay and open flames. Every time the oven turned on, I got the look. You know the one — the “If the toaster sparks, we’re done” look. ⸻ 🔥 Smoke Detector Functionality Once I finally summoned the courage (and a step stool), this thing installed easily and worked like a champ. Tested it with the “toast test” and yep — she’s got lungs. Loud enough to wake the neighbors, the pets, and possibly the dead. I feel safer already. So does my marriage. ⸻ 💵 Value for Money Excellent. A small price to pay for not living in a potential fireball and regaining my wife’s trust. Honestly, I should’ve paid more just for the emotional damage I caused by procrastinating. ⸻ 🧰 Quality & Build Solid construction. Doesn’t feel cheap or flimsy. You can tell it’s built to detect danger, not just hang out on the ceiling for decoration. ⸻ 🔄 Ease of Replacement Swapping it in for the old detector was fast and painless. If only me actually doing it had been that easy. Seriously, it took longer to unwrap it than to install it — once I finally picked up a screwdriver. ⸻ 🧯 Final Thoughts: • Yes, it works great. • Yes, it’s loud, reliable, and makes us feel safe. • No, I can’t explain why it took me a whole fiscal quarter to install it. Wife’s happy. House didn’t burn down. Marriage survived. 10/10 would delay installation again (kidding, honey).
Review: I received what I ordered. These have built in batteries with 10 year lifespan, so there is no need to replace batteries every year. I ordered 7 of these and the battery lifespan started within a couple months of my purchase date - I didn't receive anything old. The smoke alarms are all the same and easy to install. They have a third wire to use for networking.

## 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.
- 10-Year battery backup provides continuous protection during power outages
- Through early warning interconnect, when one alarm sounds, all compatible* alarms will sound
- Alarm indicator visually identifies the unit that initiated the alarm
- End-of-life warning lets you know when it’s time to replace the alarm

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CJMPZ65Q |
| Alarm | Smoke |
| Batteries | 1 9V batteries required. (included) |
| Batteries Included? | Yes |
| Batteries Required? | Yes |
| Battery Cell Type | Lithium |
| Best Sellers Rank | #3,525 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #15 in Smoke Detectors & Fire Alarms |
| Brand | First Alert |
| Color | White |
| Customer Reviews | 4.5 4.5 out of 5 stars (1,996) |
| Date First Available | September 22, 2023 |
| Included Components | Easy Adapter Plug |
| Item Package Quantity | 1 |
| Item Weight | 11.2 ounces |
| Item model number | SMI105-AC |
| Manufacturer | Resideo |
| Number of Items | 1 |
| Operating Humidity | 10-95% RH |
| Part Number | SMI105-AC |
| Pattern | SMI105-AC |
| Power Source | Battery Powered |
| Product Dimensions | 5.6"D x 5.6"W x 2"H |
| Sensor Type | Ionization |
| Size | 1-Pack |
| Style | Precision Detection |
| UPC | 029054022615 |

## Product Details

- **Alarm:** Smoke
- **Brand:** First Alert
- **Color:** White
- **Item Weight:** 0.7 Pounds
- **Number of Items:** 1
- **Operating Humidity:** 10-95% RH
- **Power Source:** Battery Powered
- **Product Dimensions:** 5.6"D x 5.6"W x 2"H
- **Sensor Type:** Ionization
- **Style:** Precision Detection

## Images

![First Alert SMI105-AC, Interconnect Hardwire Smoke Alarm with 10-Year Battery Backup, 1-Pack - Image 1](https://m.media-amazon.com/images/I/71yErRIjxzL.jpg)
![First Alert SMI105-AC, Interconnect Hardwire Smoke Alarm with 10-Year Battery Backup, 1-Pack - Image 2](https://m.media-amazon.com/images/I/8135giKniOL.jpg)
![First Alert SMI105-AC, Interconnect Hardwire Smoke Alarm with 10-Year Battery Backup, 1-Pack - Image 3](https://m.media-amazon.com/images/I/81HgNQFm-hL.jpg)
![First Alert SMI105-AC, Interconnect Hardwire Smoke Alarm with 10-Year Battery Backup, 1-Pack - Image 4](https://m.media-amazon.com/images/I/71dzUq-eckL.jpg)
![First Alert SMI105-AC, Interconnect Hardwire Smoke Alarm with 10-Year Battery Backup, 1-Pack - Image 5](https://m.media-amazon.com/images/I/71D57xvrb1L.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by A***S on 23 August 2025*

Bought this smoke detector because, you know, fire safety is important… Apparently not important enough for me to install it in under 90 days. But hey — I had other things to do. Like reorganize the garage. Twice. And stare at it in the box on the kitchen counter like it was going to mount itself. Meanwhile, my wife spent three months walking past it like she was in a house made of dry hay and open flames. Every time the oven turned on, I got the look. You know the one — the “If the toaster sparks, we’re done” look. ⸻ 🔥 Smoke Detector Functionality Once I finally summoned the courage (and a step stool), this thing installed easily and worked like a champ. Tested it with the “toast test” and yep — she’s got lungs. Loud enough to wake the neighbors, the pets, and possibly the dead. I feel safer already. So does my marriage. ⸻ 💵 Value for Money Excellent. A small price to pay for not living in a potential fireball and regaining my wife’s trust. Honestly, I should’ve paid more just for the emotional damage I caused by procrastinating. ⸻ 🧰 Quality & Build Solid construction. Doesn’t feel cheap or flimsy. You can tell it’s built to detect danger, not just hang out on the ceiling for decoration. ⸻ 🔄 Ease of Replacement Swapping it in for the old detector was fast and painless. If only me actually doing it had been that easy. Seriously, it took longer to unwrap it than to install it — once I finally picked up a screwdriver. ⸻ 🧯 Final Thoughts: • Yes, it works great. • Yes, it’s loud, reliable, and makes us feel safe. • No, I can’t explain why it took me a whole fiscal quarter to install it. Wife’s happy. House didn’t burn down. Marriage survived. 10/10 would delay installation again (kidding, honey).

### ⭐⭐⭐⭐ Review
*by J***D on 13 September 2024*

I received what I ordered. These have built in batteries with 10 year lifespan, so there is no need to replace batteries every year. I ordered 7 of these and the battery lifespan started within a couple months of my purchase date - I didn't receive anything old. The smoke alarms are all the same and easy to install. They have a third wire to use for networking.

### ⭐⭐⭐⭐⭐ Review
*by J***M on 10 February 2026*

They are working great with no problems

## Frequently Bought Together

- First Alert SMI105-AC, Interconnect Hardwire Smoke Alarm with 10-Year Battery Backup, 1-Pack
- First Alert SMICO105-AC, Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with 10-Year Battery Backup, 3-Pack
- First Alert Combination Smoke & Carbon Monoxide Alarm, Interconnect Hardwire Detector with Battery Backup, SMICO100-AC, 1-Pack

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*Product available on Desertcart Netherlands*
*Store origin: NL*
*Last updated: 2026-02-16*