---
product_id: 603744197
title: "SMICO105-AC, Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with 10-Year Battery Backup, 3-Pack"
brand: "first alert"
price: "€ 370.41"
currency: EUR
in_stock: true
reviews_count: 8
category: "First Alert"
url: https://www.desertcart.com.cy/products/603744197-smico105-ac-interconnect-hardwire-combination-smoke-and-carbon-monoxide-alarm
store_origin: CY
region: Cyprus
---

# 10-Year Battery Backup Interconnect Early Warning Precision Detection tech SMICO105-AC, Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with 10-Year Battery Backup, 3-Pack

**Brand:** first alert
**Price:** € 370.41
**Availability:** ✅ In Stock

## Summary

> 🚨 Stay ahead of danger with seamless, smart protection!

## Quick Answers

- **What is this?** SMICO105-AC, Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with 10-Year Battery Backup, 3-Pack by first alert
- **How much does it cost?** € 370.41 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.cy](https://www.desertcart.com.cy/products/603744197-smico105-ac-interconnect-hardwire-combination-smoke-and-carbon-monoxide-alarm)

## 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

- • **Visual Alarm ID:** Easily spot which unit triggered the alert with a clear visual indicator.
- • **Hassle-Free Setup:** Quick Connect Plug means no rewiring—install in minutes, stress-free.
- • **Smart Interconnect:** When one alarm sounds, all compatible alarms alert instantly—whole-home peace of mind.
- • **Dual Threat Defense:** Smoke + CO detection in one sleek unit for total home safety.
- • **10-Year Power Assurance:** Long-lasting lithium battery backup keeps you protected even during outages.

## Overview

The First Alert SMICO105-AC is a 3-pack of hardwired combination smoke and carbon monoxide alarms featuring advanced Precision Detection technology to reduce false alarms. It includes a 10-year lithium battery backup for continuous protection during power outages and supports interconnectivity with other compatible alarms for whole-home early warning. Easy to install with a Quick Connect Plug and equipped with a visual alarm indicator, it’s designed to keep your home safe with minimal hassle.

## Description

Install convenient 2-in-1 protection against both smoke and carbon monoxide with the First Alert SMICO105-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with 10-Year Battery Backup. Meets new industry standards and can interconnect with other compatible alarms to create a whole home safety network to help provide an early warning.

Review: Smoke and carbon monoxide replacement - Replaced my old ones with these 10 year battery units. They were an exact replacement and they all tested good. Very easy to replace.
Review: Exactly what I needed, fits, and works great! - Exactly what I needed and it was easy to install. It worked on the self-test and now I don’t need to worry about the battery for 10 years. The plug fit the wire from my ceiling perfectly with no adapter or rewire needed. The 10 year old plastic ring base didn’t fit the new alarm, but it was very easy to replace that using the existing screws and electrical box that was already there in my ceiling. I didn’t even need to remove the screws, just loosen them to twist off the old and replace it with the new then tighten the screws. It only took a minute or two.

## Features

- First Alerts 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
- Quick Connect Plug allows for easy installation with no need to rewire
- Alarm indicator visually identifies the unit that initiated the alarm

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | First Alert |
| Style | Smoke, CO |
| Power Source | Corded Electric |
| Color | White |
| Product Dimensions | 2.25"D x 5.69"W x 5.69"H |
| Item Weight | 10.56 ounces |
| Alarm | Audible |
| Sensor Type | Ionization |
| Number of Items | 3 |
| Manufacturer | Resideo |
| UPC | 029054022875 |
| Part Number | SMICO105-AC |
| Item Weight | 10.6 ounces |
| Item model number | SMICO105-AC |
| Batteries | 1 9V batteries required. (included) |
| Size | 3-Pack |
| Item Package Quantity | 1 |
| Included Components | Easy Adapter Plug |
| Batteries Included? | Yes |
| Batteries Required? | Yes |
| Battery Cell Type | Lithium |

## Product Details

- **Brand:** First Alert
- **Style:** Smoke, CO
- **Power Source:** Corded Electric
- **Color:** White
- **Product Dimensions:** 2.25"D x 5.69"W x 5.69"H
- **Item Weight:** 10.56 ounces
- **Alarm:** Audible
- **Sensor Type:** Ionization
- **Number of Items:** 3
- **Manufacturer:** Resideo

## Images

![SMICO105-AC, Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with 10-Year Battery Backup, 3-Pack - Image 1](https://m.media-amazon.com/images/I/715u0TY1WBL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Smoke and carbon monoxide replacement
*by B***E on February 8, 2026*

Replaced my old ones with these 10 year battery units. They were an exact replacement and they all tested good. Very easy to replace.

### ⭐⭐⭐⭐⭐ Exactly what I needed, fits, and works great!
*by L***N on December 26, 2025*

Exactly what I needed and it was easy to install. It worked on the self-test and now I don’t need to worry about the battery for 10 years. The plug fit the wire from my ceiling perfectly with no adapter or rewire needed. The 10 year old plastic ring base didn’t fit the new alarm, but it was very easy to replace that using the existing screws and electrical box that was already there in my ceiling. I didn’t even need to remove the screws, just loosen them to twist off the old and replace it with the new then tighten the screws. It only took a minute or two.

### ⭐⭐⭐⭐⭐ Smoke and CO detection at a reasonable price, no batteries ever required!
*by B***T on December 29, 2024*

Recently, the carbon monoxide/smoke detectors I had installed in my home soon after we moved in started making strange beeps. They weren't triggered and the batteries weren't dead. Turns out they EXPIRE after ten years, thanks to natural sensor degradation. Nothing can be done for this, and they won't stay quiet for long--my only choice was to remove them and get new ones. Older ones don't have this feature--they just hang out like they're protecting you, but DON'T, so expiring is actually a good thing. Since they only last 10 years, these have the additional option of including a sealed, non-replaceable battery that's guaranteed to last the entire 10 years! No more battery changes, just a new unit every 10 years. They're easy to install, and if your system is wired into your house so that all of them trigger when one does, it's a simple plug-and-play if your prior system had the same connectors. If not, you can replace them yourself if you're qualified, or have them installed for you, available through Amazon. These were no trouble at all to install and now there's no more need yearly battery swaps, a win in my book.

## Frequently Bought Together

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

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*Product available on Desertcart Cyprus*
*Store origin: CY*
*Last updated: 2026-03-15*