---
product_id: 602000076
title: "Combination Smoke & Carbon Monoxide Alarm, Interconnect Hardwire Detector with Battery Backup, SMICO100-AC, 1-Pack"
brand: "first alert"
price: "NT$3990"
currency: TWD
in_stock: true
reviews_count: 13
category: "First Alert"
url: https://www.desertcart.tw/products/602000076-combination-smoke-and-carbon-monoxide-alarm-interconnect-hardwire-detector-battery
store_origin: TW
region: Taiwan
---

# Hardwired + battery backup Interconnects all alarms Precision smoke & CO detection Combination Smoke & Carbon Monoxide Alarm, Interconnect Hardwire Detector with Battery Backup, SMICO100-AC, 1-Pack

**Brand:** first alert
**Price:** NT$3990
**Availability:** ✅ In Stock

## Summary

> 🏠 Stay safe, stay connected—because your home deserves smarter protection.

## Quick Answers

- **What is this?** Combination Smoke & Carbon Monoxide Alarm, Interconnect Hardwire Detector with Battery Backup, SMICO100-AC, 1-Pack by first alert
- **How much does it cost?** NT$3990 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/products/602000076-combination-smoke-and-carbon-monoxide-alarm-interconnect-hardwire-detector-battery)

## 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

- • **Test & Silence Control:** One button tests both smoke and CO sensors for peace of mind.
- • **Effortless Installation:** Quick Connect Plug means no rewiring headaches—get protected fast.
- • **Seamless Interconnectivity:** When one alarm sounds, all alarms alert—total home coverage.
- • **Advanced Precision Detection:** Reduces false alarms while delivering early fire and CO warnings.
- • **Uninterrupted Power Assurance:** Hardwired with battery backup ensures protection even during outages.

## Overview

The First Alert SMICO100-AC is a cutting-edge combination smoke and carbon monoxide alarm featuring Precision Detection technology. It hardwires into your home’s electrical system with a 9V battery backup for continuous protection. Its interconnect capability ensures that when one alarm detects danger, all alarms sound simultaneously, providing comprehensive early warning. Designed for easy installation with a Quick Connect Plug and equipped with a test/silence button, this reliable device meets new industry standards to reduce nuisance alarms and keep your family safe.

## 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: Reliable and Essential Safety Upgrade! - 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

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CLVRSC1Q |
| Alarm | Smoke, CO |
| Batteries | 1 9V batteries required. (included) |
| Batteries Included? | Yes |
| Batteries Required? | Yes |
| Battery Cell Type | Alkaline |
| Best Sellers Rank | #269 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #2 in Smoke & Carbon Monoxide Alarms |
| Brand | First Alert |
| Color | White |
| Customer Reviews | 4.6 4.6 out of 5 stars (27,798) |
| Date First Available | October 26, 2023 |
| Included Components | Easy Adapter Plug, 9V Battery |
| Item Package Quantity | 1 |
| Item Weight | 9 ounces |
| Item model number | SMICO100-AC |
| Manufacturer | Resideo |
| Number of Items | 1 |
| Operating Humidity | 10-95% RH |
| Part Number | SMICO100-AC |
| Pattern | SMICO100-AC |
| Power Source | Corded Electric |
| Product Dimensions | 5.5"D x 2"W x 5.5"H |
| Sensor Type | Ionization |
| Size | 1-Pack |
| Style | Precision Detection |
| UPC | 029054022752 |

## Product Details

- **Alarm:** Smoke, CO
- **Brand:** First Alert
- **Color:** White
- **Item Weight:** 8.96 ounces
- **Number of Items:** 1
- **Operating Humidity:** 10-95% RH
- **Power Source:** Corded Electric
- **Product Dimensions:** 5.5"D x 2"W x 5.5"H
- **Sensor Type:** Ionization
- **Style:** Precision Detection

## Images

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

## 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.

### ⭐⭐⭐⭐⭐ Reliable and Essential Safety Upgrade!
*by A***N on January 10, 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!

### ⭐⭐⭐⭐⭐ 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!

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*Product available on Desertcart Taiwan*
*Store origin: TW*
*Last updated: 2026-01-29*