---
product_id: 602000077
title: "Hardwire Combination Smoke & Carbon Monoxide Alarm"
brand: "first alert"
price: "€ 305.44"
currency: EUR
in_stock: true
reviews_count: 8
category: "First Alert"
url: https://www.desertcart.hr/products/602000077-hardwire-combination-smoke-and-carbon-monoxide-alarm
store_origin: HR
region: Croatia
---

# Hardwired with battery backup Precision Detection tech Interconnects multiple alarms Hardwire Combination Smoke & Carbon Monoxide Alarm

**Brand:** first alert
**Price:** € 305.44
**Availability:** ✅ In Stock

## Summary

> 🔥 Stay ahead of danger with smart, seamless safety ⚡

## Quick Answers

- **What is this?** Hardwire Combination Smoke & Carbon Monoxide Alarm by first alert
- **How much does it cost?** € 305.44 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/602000077-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

- • **User-Friendly Testing:** Test/silence button ensures your alarm is always ready without the hassle.
- • **Effortless Installation:** Quick Connect Plug means no rewiring headaches.
- • **Uninterrupted Protection:** Battery backup keeps you safe even during power outages.
- • **Seamless Interconnectivity:** One alarm sounds, all alarms respond—total home coverage.
- • **Precision Detection Technology:** Reduces false alarms, so you only react when it really matters.

## Overview

The First Alert SMICO100-AC is a cutting-edge hardwired smoke and carbon monoxide alarm featuring advanced Precision Detection technology to minimize nuisance alerts. It interconnects easily with compatible alarms for whole-home protection, includes a battery backup for power outage reliability, and offers a quick connect plug for hassle-free installation. Trusted by thousands, it’s a top-ranked safety essential for modern homes.

## Description

The SMICO100-AC Interconnect Hardwire 2-in-1 Smoke & CO Alarm with Battery Backup utilizes First Alert's Precision Detection technology and meets new industry standards. Easily install and interconnect multiple alarms together to create an alarm system throughout your home.

Review: Reliable & Reputable Detectors! - I have been a master electrician for 32+ years. If you're not 100% sure of what you're doing, hire a professional! Ok a lot of people are complaining about the new connector. It literally takes 60 seconds to rewire. I rewire anyways so I can put a meter on the ceiling wires to make sure everything is as it should be. The base is a tad smaller than my previous ones. They were from a different company though. It presented zero issues during the installation. I have 3 detectors upstairs and one in the basement. I wired them all and they all worked inline perfectly. When one goes off, they all go off. The alarm is very loud and high pitched. It also tests both the smoke and CO² detectors when pushing the test button. You'll get a beep and then another beep. Then it repeats. Meaning they are all working. Bonus each detector comes with a pre installed Duracell 9 volt battery. You also receive a dust cover for the detector if you need to work in that room. Kicking up dust or debris can get inside the unit and fault it. Nice little freebie to have. Although I didn't need, they come with very detailed instructions with diagrams. After I installed them all I tested it my way using certain techniques to get both detectors to alert. They passed on both smoke and CO². For this price point, I am very happy with these units. It gives me a sense of security knowing my family is protected. Please mark the back of your detectors with the date you install them. I use a black marker. Also be sure you were shipped the correct units. It should say on the outside label Combination Smoke/Carbon Monoxide Alarm. I've posted pictures along with a video. I hope this aids with your decision whether these are for your home or not. I will update again if I have any issues in the future. As of now they are working as they should and I again, am very happy with my purchase.
Review: Safety Simplified: A Great Upgrade for Peace of Mind! - We recently installed the First Alert Combination Smoke & Carbon Monoxide Alarm, Interconnect Hardwire Detector, and we are extremely pleased with the decision. This unit is an outstanding choice for anyone looking to upgrade their home safety system, combining two essential protections into one convenient device. Top Features We Appreciated Dual Protection for Ultimate Peace of Mind: The biggest win here is having both smoke and carbon monoxide (CO) monitoring in a single unit. It gives great peace of mind knowing that the home is covered for two of the most critical household threats. It simplifies maintenance and ensures comprehensive safety. Seamless System Integration: A major selling point for us was its compatibility with our existing setup. This First Alert detector fit perfectly into our previous interconnected system (hardwired). The installation was straightforward, and it immediately linked up with the other alarms in the house, ensuring that if one goes off, they all do. This interconnectivity is vital for alerting everyone, no matter where they are in the house. Reliable Brand: First Alert is a name synonymous with home safety, and the quality of the unit feels robust and reliable. Conclusion If you are looking to replace old, separate smoke and CO alarms, or if you simply need to upgrade to a hardwired, interconnected system, this combination alarm is a superb choice. It delivers on its promise of simplifying safety while maximizing protection. Highly recommended!

## 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
- Quick Connect Plug allows for easy installation with no need to rewire
- Battery backup provides continuous protection during power outages
- Test/silence button for efficient testing to ensure alarm is working properly

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CLVQF7MC |
| Alarm | Smoke, CO |
| Best Sellers Rank | #192 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #2 in Smoke & Carbon Monoxide Alarms #10 in Carbon Monoxide Detectors |
| Brand | First Alert |
| Built-In Media | Easy Adapter Plug, 9V Battery |
| Color | White |
| Customer Reviews | 4.4 out of 5 stars 1,680 Reviews |
| Item Type Name | Combination Alarm |
| Item Weight | 1.7 pounds |
| Manufacturer | Resideo |
| Mfr Part Number | SMICO100-AC |
| Model Number | SMICO100-AC |
| Number of Items | 3 |
| Power Source | Corded Electric |
| Product Style | Precision Detection |
| Sensor Type | Ionization |
| Style | Precision Detection |
| UPC | 029054022769 |
| Unit Count | 3 Count |

## Product Details

- **Alarm:** Smoke, CO
- **Brand:** First Alert
- **Color:** White
- **Item Highlight:** SMICO100-AC
- **Item Weight:** 1.7 pounds
- **Number of Items:** 3
- **Power Source:** Corded Electric
- **Sensor Type:** Ionization
- **Style:** Precision Detection
- **Unit Count:** 3 Count

## Images

![Hardwire Combination Smoke & Carbon Monoxide Alarm - Image 1](https://m.media-amazon.com/images/I/81szIilT2dL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Reliable & Reputable Detectors!
*by B***S on October 21, 2025*

I have been a master electrician for 32+ years. If you're not 100% sure of what you're doing, hire a professional! Ok a lot of people are complaining about the new connector. It literally takes 60 seconds to rewire. I rewire anyways so I can put a meter on the ceiling wires to make sure everything is as it should be. The base is a tad smaller than my previous ones. They were from a different company though. It presented zero issues during the installation. I have 3 detectors upstairs and one in the basement. I wired them all and they all worked inline perfectly. When one goes off, they all go off. The alarm is very loud and high pitched. It also tests both the smoke and CO² detectors when pushing the test button. You'll get a beep and then another beep. Then it repeats. Meaning they are all working. Bonus each detector comes with a pre installed Duracell 9 volt battery. You also receive a dust cover for the detector if you need to work in that room. Kicking up dust or debris can get inside the unit and fault it. Nice little freebie to have. Although I didn't need, they come with very detailed instructions with diagrams. After I installed them all I tested it my way using certain techniques to get both detectors to alert. They passed on both smoke and CO². For this price point, I am very happy with these units. It gives me a sense of security knowing my family is protected. Please mark the back of your detectors with the date you install them. I use a black marker. Also be sure you were shipped the correct units. It should say on the outside label Combination Smoke/Carbon Monoxide Alarm. I've posted pictures along with a video. I hope this aids with your decision whether these are for your home or not. I will update again if I have any issues in the future. As of now they are working as they should and I again, am very happy with my purchase.

### ⭐⭐⭐⭐⭐ Safety Simplified: A Great Upgrade for Peace of Mind!
*by R***R on December 12, 2025*

We recently installed the First Alert Combination Smoke & Carbon Monoxide Alarm, Interconnect Hardwire Detector, and we are extremely pleased with the decision. This unit is an outstanding choice for anyone looking to upgrade their home safety system, combining two essential protections into one convenient device. Top Features We Appreciated Dual Protection for Ultimate Peace of Mind: The biggest win here is having both smoke and carbon monoxide (CO) monitoring in a single unit. It gives great peace of mind knowing that the home is covered for two of the most critical household threats. It simplifies maintenance and ensures comprehensive safety. Seamless System Integration: A major selling point for us was its compatibility with our existing setup. This First Alert detector fit perfectly into our previous interconnected system (hardwired). The installation was straightforward, and it immediately linked up with the other alarms in the house, ensuring that if one goes off, they all do. This interconnectivity is vital for alerting everyone, no matter where they are in the house. Reliable Brand: First Alert is a name synonymous with home safety, and the quality of the unit feels robust and reliable. Conclusion If you are looking to replace old, separate smoke and CO alarms, or if you simply need to upgrade to a hardwired, interconnected system, this combination alarm is a superb choice. It delivers on its promise of simplifying safety while maximizing protection. Highly recommended!

### ⭐⭐⭐⭐⭐ Peace of Mind From a Trusted Brand
*by M***S on June 15, 2026*

Fortunately, I hope I never have to rely on these in an emergency, but it's reassuring to have them installed. First Alert has a long-standing reputation for reliability, and these detectors were easy to install and integrate into my existing system. The combination smoke and carbon monoxide protection provides added peace of mind for my home and family. A purchase you hope you never need, but one you're glad to have

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-09-11*