---
product_id: 2215238
title: "SCO501CN-3ST Wireless Interconnected Combination Smoke and Carbon Monoxide Alarm with Voice Location, Battery Operated (pack of 1)"
brand: "first alert"
price: "₩249611"
currency: KRW
in_stock: true
reviews_count: 8
url: https://www.desertcart.kr/products/2215238-sco501cn-3st-wireless-interconnected-combination-smoke-and-carbon-monoxide-alarm
store_origin: KR
region: South Korea
---

# Wireless interconnect up to 18 units 85 dB loud voice & siren alert Battery operated with EZ access drawer SCO501CN-3ST Wireless Interconnected Combination Smoke and Carbon Monoxide Alarm with Voice Location, Battery Operated (pack of 1)

**Brand:** first alert
**Price:** ₩249611
**Availability:** ✅ In Stock

## Summary

> 🔥 Stay ahead of danger with smart, wireless peace of mind 📶

## Quick Answers

- **What is this?** SCO501CN-3ST Wireless Interconnected Combination Smoke and Carbon Monoxide Alarm with Voice Location, Battery Operated (pack of 1) by first alert
- **How much does it cost?** ₩249611 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/2215238-sco501cn-3st-wireless-interconnected-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

- • **Trusted Legacy of Safety:** From the pioneers in home safety since 1958, backed by a 5-year warranty.
- • **Clear Voice Location Alerts:** Know exactly where danger strikes with programmable voice notifications.
- • **Seamless Wireless Safety Network:** Connect up to 18 alarms for whole-home protection without messy wiring.
- • **Effortless Installation & Maintenance:** Battery powered with easy-access drawer—no ceiling removal needed.
- • **Photoelectric & Electrochemical Sensors:** Advanced dual-sensing tech reduces false alarms and detects deadly CO leaks.

## Overview

The First Alert SCO501CN-3ST is a battery-operated combination smoke and carbon monoxide alarm featuring wireless interconnectivity with up to 18 units, an 85-decibel loud siren paired with clear voice location alerts, and advanced photoelectric and electrochemical sensors to minimize false alarms while maximizing safety. Designed for easy installation and maintenance, it offers a trusted 5-year warranty from a brand with over six decades of home safety expertise.

## Description

Product Description The First Alert SCO501CN 3ST Combination Smoke and Carbon Monoxide Alarm with Voice Location detects both smoke and carbon monoxide in a single device. The alarm interconnects with up to 18 other First Alert enabled alarms in your home to create a wireless safety network. The photoelectric smoke sensor is designed to reduce false alarms from cooking smoke or shower steam while remaining sensitive to real danger. The advanced electrochemical CO sensor detects carbon monoxide leaks from multiple sources, including faulty fuel burning appliances. A loud 85 decibel siren and a voice alarm with 11 programmable locations indicate where and what the threat is. EZ access battery drawer, no need to remove alarm from ceiling to change battery. From the Manufacturer Keep your family safe from both fire and carbon monoxide poisoning with the First Alert ONELINK battery operated combination Smoke and Carbon Monoxide Alarm. ONELINK offers the same interconnected functionality as standard hardwired alarms without wires. The alarms communicate with each other and may provide an earlier warning of potential danger when people are in different locations in the home. The sooner you know, the sooner emergency responders can be notified, this may help reduce the potential loss of life and property damage. When compared to retrofitting an existing home, First Alert ONELINK costs much less than installing hardwired alarms in existing walls and/or ceilings. They are cost effective and easy to install. First Alert Exclusive voice alarm is programmable with up to eleven locations. Additional battery operated alarms may be added to create a wireless safety network. Photoelectric Smoke Sensing Technology reduces nuisance alarms and is environmentally friendlier. The Electrochemical Carbon Monoxide Sensor is the most accurate technology available. Comes complete with Test/Silence Button, Low Battery Warning, two AA Batteries and 5 year warranty.

Review: Very Effective, Well Worth the Money - I have purchased a property that was lacking in the smoke alarm department and had no wireless interconnection and these were the first choice. They are very easy to pair and install. Fair warning though, they are loud. I wore my noise cancelling earbuds and even through those, I can clearly hear them. The quality is good, you can hear them clearly when they give the location of which one went off. These things are also very functional as I had unintentionally set them off less than a couple weeks of installation. They will save your life in a fire. I highly recommend getting these as they are worth the investment.
Review: Easy installation and setup...worked when kitchen got smoky - Update: A little cooking accident caused a lot of smoke (no fire). The nearest alarm went off properly, and all of the linked alarms went off as well. Silencing the alarm required holding down the silence button for five seconds or so, which silenced all of the linked alarms. This review is based ONLY on the installation and setup. I just installed 7 units. The installation is very easy...took me about 60 seconds per unit to install the mounting rings.. You'll need a Phillips head screwdriver and a drill with a 3/16 bit for the mounting holes. I'm pretty handy with tools, but there was nothing involved in this that a novice should have difficulty with. Follow the instructions for where they should be mounted. There is a "dead zone" where walls and ceilings meet. Smoke detectors are ineffective in that zone. The previous owner of my home mounted all of the old detectors right in the dead zone. Oops. The programming is easy IF you read the directions and follow them exactly. Women should do fine; men will probably have to try programming a couple times before they figure out which simple step they overlooked. (I got it on the second attempt.) If you are overdue for new bifocals like I am, you might need a magnifying glass. The programming took less than a minute per unit when I did it correctly. Use hearing protection while you are programming and and testing. Seriously. All of the units will be going off at the same time on the table in front of you. At 85 decibels each, it is extremely loud, My total project time for installing all 7 was about 45 minutes hour from opening the box to putting up my tools. My units are spread out over three levels of the house (one in the basement, two on the first floor, one in an upstairs hallway, and one in each of three bedrooms). No issues with them communicating with each other. I tested each one individually and made certain it was communicating with all the others just to be sure. Running up and down all the stairs 7 times was a good workout. Again, hearing protection is advised. I have no doubt we will all be awakened if we ever have a fire in middle of the night. I really like the voice feature. If I have an alarm I will not have to go running through the house to figure out where the problem is. It clearly enunciates which unit is going off. Hopefully I will never find out how they operate in an emergency. I will update if I have any operational issues.

## Features

- The front cover design of the alarm may vary but product function remains the same.
- Battery operated smoke and carbon monoxide alarm can be installed easily
- Connects multiple alarms together for wireless safety network
- Voice alarm gives clear indication of where the problem is located
- Features photoelectric smoke sensor and electrochemical CO sensor
- One button silences a false alarm and tests the unit. Loud 85 decibel alarm
- NOTE: Kindly refer to the user manual provided as a PDF manual in the product description section
- First Alert has been the most trusted brand in home safety since launching the first residential smoke alarm in 1958 (Based on a First Alert Brand Trust Survey in February 2018)
- Smoke particles of varying number and size are produced in all fires. For maximum protection, use both ionization and photoelectric sensing technologies. Ionization alarms are generally more sensitive to fast flaming fires and photoelectric alarms are generally more sensitive to smoldering fires

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | First Alert |
| Color | White |
| Item Weight | 3.2 ounces |
| Power Source | Battery Powered |
| Product Dimensions | 2"D x 5"W x 5"H |
| Style | Standard Detection |

## Product Details

- **Alarm:** Audible
- **Brand:** First Alert
- **Color:** White
- **Global Trade Identification Number:** 00029054002457
- **Item Weight:** 0.2 Pounds
- **Material:** FIRST ALERT SCO501CN-3ST ONELINK Battery-Operated Combination Smoke & Carbon Monoxide Alarm with
- **Power Source:** Battery Powered
- **Product Dimensions:** 2"D x 5"W x 5"H
- **Sensor Type:** electrochemical,photoelectric
- **Style:** Standard Detection

## Images

![SCO501CN-3ST Wireless Interconnected Combination Smoke and Carbon Monoxide Alarm with Voice Location, Battery Operated (pack of 1) - Image 1](https://m.media-amazon.com/images/I/61e5TRDubdL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Very Effective, Well Worth the Money
*by A***S on September 17, 2025*

I have purchased a property that was lacking in the smoke alarm department and had no wireless interconnection and these were the first choice. They are very easy to pair and install. Fair warning though, they are loud. I wore my noise cancelling earbuds and even through those, I can clearly hear them. The quality is good, you can hear them clearly when they give the location of which one went off. These things are also very functional as I had unintentionally set them off less than a couple weeks of installation. They will save your life in a fire. I highly recommend getting these as they are worth the investment.

### ⭐⭐⭐⭐⭐ Easy installation and setup...worked when kitchen got smoky
*by S***M on January 13, 2014*

Update: A little cooking accident caused a lot of smoke (no fire). The nearest alarm went off properly, and all of the linked alarms went off as well. Silencing the alarm required holding down the silence button for five seconds or so, which silenced all of the linked alarms. This review is based ONLY on the installation and setup. I just installed 7 units. The installation is very easy...took me about 60 seconds per unit to install the mounting rings.. You'll need a Phillips head screwdriver and a drill with a 3/16 bit for the mounting holes. I'm pretty handy with tools, but there was nothing involved in this that a novice should have difficulty with. Follow the instructions for where they should be mounted. There is a "dead zone" where walls and ceilings meet. Smoke detectors are ineffective in that zone. The previous owner of my home mounted all of the old detectors right in the dead zone. Oops. The programming is easy IF you read the directions and follow them exactly. Women should do fine; men will probably have to try programming a couple times before they figure out which simple step they overlooked. (I got it on the second attempt.) If you are overdue for new bifocals like I am, you might need a magnifying glass. The programming took less than a minute per unit when I did it correctly. Use hearing protection while you are programming and and testing. Seriously. All of the units will be going off at the same time on the table in front of you. At 85 decibels each, it is extremely loud, My total project time for installing all 7 was about 45 minutes hour from opening the box to putting up my tools. My units are spread out over three levels of the house (one in the basement, two on the first floor, one in an upstairs hallway, and one in each of three bedrooms). No issues with them communicating with each other. I tested each one individually and made certain it was communicating with all the others just to be sure. Running up and down all the stairs 7 times was a good workout. Again, hearing protection is advised. I have no doubt we will all be awakened if we ever have a fire in middle of the night. I really like the voice feature. If I have an alarm I will not have to go running through the house to figure out where the problem is. It clearly enunciates which unit is going off. Hopefully I will never find out how they operate in an emergency. I will update if I have any operational issues.

### ⭐⭐⭐⭐⭐ Awesome Interconnected Smoke & Carbon monoxide detector (battery unit) with voice
*by J***W on August 15, 2025*

I've used previous iterations of this Battery operated (Wirelessly Interconnected) Smoke & Carbon Monoxide Detector (w/voice) in the past and this unit (SMCO500V) lives up to its predecessor. It's simple to use and setup (provided instructions are read - to pair the units wirelessly to work together). - They're Loud...but Not too loud - thankfully. - The mounts are a standard design to other smoke detectors (that can screw into the ceiling apparatus) and thus no new mounts were needed to attach these units in my home. - Battery-wise: If these units function like their predecessors - I'm sure it will last for several months on the eneloop AAs which I have been using for smoke detectors over the years. - Battery drawers are easy to pull open and get the batteries out. Simply push upwards from the bottom (of the battery drawer) to release and swap your batteries. - Haven't experienced any false Alarms with these particular units yet...but will update this review if I do. - All in all, a good device that lives up to its predecessor 👍

## Frequently Bought Together

- FIRST ALERT SCO501CN-3ST Smoke and Carbon Monoxide Alarm, 120 V, White, Pack of 1
- FireAngel Carbon Monoxide Alarm and Detector - FA6813 10-Year Sensor Life CO Alarm for Home with AA Batteries - Travel, Portable Carbon Monoxide Detector - CO Detector Monitor with Test Button
- FireAngel Combination Smoke and Carbon Monoxide Alarm for Home - SCB10-R, 10 Year Life, Dual Carbon Monoxide Detector and Smoke Alarm with Test and Hush Button - Combined CO and Fire Alarm - White

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.kr/products/2215238-sco501cn-3st-wireless-interconnected-combination-smoke-and-carbon-monoxide-alarm](https://www.desertcart.kr/products/2215238-sco501cn-3st-wireless-interconnected-combination-smoke-and-carbon-monoxide-alarm)

---

*Product available on Desertcart South Korea*
*Store origin: KR*
*Last updated: 2026-03-13*