---
product_id: 666201732
title: "SMICO100-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with Battery Backup, 1-Pack"
brand: "first alert"
price: "HK$1314"
currency: HKD
in_stock: true
reviews_count: 5
category: "First Alert"
url: https://www.desertcart.hk/products/666201732-smico100-ac-interconnect-hardwire-combination-smoke-and-carbon-monoxide-alarm
store_origin: HK
region: Hong Kong
---

# Battery backup power Interconnects all alarms Precision Detection tech SMICO100-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with Battery Backup, 1-Pack

**Brand:** first alert
**Price:** HK$1314
**Availability:** ✅ In Stock

## Summary

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

## Quick Answers

- **What is this?** SMICO100-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with Battery Backup, 1-Pack by first alert
- **How much does it cost?** HK$1314 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/666201732-smico100-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

- • **Reliable Battery Backup:** Continuous protection even during power outages keeps your home secure 24/7.
- • **Dual Smoke & CO Detection:** One device safeguards against both smoke and carbon monoxide threats.
- • **Precision Detection Technology:** Advanced sensors reduce false alarms and catch fires early.
- • **Easy Quick Connect Installation:** No rewiring hassle—plug and play setup saves time and stress.
- • **Seamless Interconnect Capability:** When one alarm sounds, all compatible alarms alert simultaneously for full-home safety.

## Overview

The SMICO100-AC by First Alert is a hardwired combination smoke and carbon monoxide alarm featuring advanced Precision Detection technology to minimize nuisance alerts and provide early fire warnings. It interconnects with compatible alarms so that when one sounds, all do, ensuring whole-home alerting. Equipped with a battery backup, it guarantees continuous operation during power outages. Easy to install with a quick connect plug, this 2-in-1 device offers reliable, professional-grade safety 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: 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: I recently installed the First Alert Combination Smoke & Carbon Monoxide Alarm (SMICO100-AC), and I’m very pleased with its performance. Installation was straightforward — the hardwired setup with battery backup provides peace of mind knowing it stays powered even if the electricity goes out. This alarm detects both smoke and carbon monoxide, which gives me confidence that my home is protected on multiple levels with just one device. It’s loud and responsive during testing, and the included battery backup is a great safety feature. The interconnect capability is excellent too — when one alarm sounds, all interconnected units activate, which is ideal for larger homes. Overall, this feels like a high-quality product from a trusted brand. Easy to install, dependable, and a smart investment in home safety. Highly recommend!

## 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
- Through early warning interconnect, when one alarm sounds, all compatible
- 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
- 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

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CLVRSC1Q |
| Item model number | SMICO100-AC |
| Manufacturer | FIRST ALERT |
| Product Dimensions | 20.32 x 19.05 x 8.89 cm; 254.01 g |

## Product Details

- **Brand:** First Alert
- **Item weight:** 254 g
- **Manufacturer:** FIRST ALERT
- **Number of Items:** 1
- **UPC:** 029054022752

## Images

![SMICO100-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with Battery Backup, 1-Pack - Image 1](https://m.media-amazon.com/images/I/81fINKkMRSL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by B***S on 21 October 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.

### ⭐⭐⭐⭐⭐ Review
*by A***N on 10 January 2026*

I recently installed the First Alert Combination Smoke & Carbon Monoxide Alarm (SMICO100-AC), and I’m very pleased with its performance. Installation was straightforward — the hardwired setup with battery backup provides peace of mind knowing it stays powered even if the electricity goes out. This alarm detects both smoke and carbon monoxide, which gives me confidence that my home is protected on multiple levels with just one device. It’s loud and responsive during testing, and the included battery backup is a great safety feature. The interconnect capability is excellent too — when one alarm sounds, all interconnected units activate, which is ideal for larger homes. Overall, this feels like a high-quality product from a trusted brand. Easy to install, dependable, and a smart investment in home safety. Highly recommend!

### ⭐⭐⭐⭐⭐ Review
*by A***1 on 12 February 2026*

Easy installation especially if you already had a previous alarm in same spot. Even came with a Duracell battery backup, no junk. Good buy in my opinion.

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*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-03-21*