---
product_id: 289635423
title: "First Alert Carbon Monoxide Detector Alarm | Plug-In with Battery Backup, CO605"
brand: "first alert"
price: "€ 1.97"
currency: EUR
in_stock: false
reviews_count: 5
url: https://www.desertcart.es/products/289635423-first-alert-carbon-monoxide-detector-alarm-plug-in-with-battery
store_origin: ES
region: Spain
---

# Backlit digital display with peak memory Battery backup for power outage safety Detachable plug for flexible mounting First Alert Carbon Monoxide Detector Alarm | Plug-In with Battery Backup, CO605

**Brand:** first alert
**Price:** € 1.97
**Availability:** ❌ Out of Stock

## Summary

> 🚨 Stay ahead of danger with smart, flexible CO protection!

## Quick Answers

- **What is this?** First Alert Carbon Monoxide Detector Alarm | Plug-In with Battery Backup, CO605 by first alert
- **How much does it cost?** € 1.97 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.es](https://www.desertcart.es/products/289635423-first-alert-carbon-monoxide-detector-alarm-plug-in-with-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

- • **Clear & Intuitive:** Backlit digital display shows real-time CO levels and peak readings at a glance.
- • **Flexible Placement:** Detachable 6-foot power cord lets you mount at eye level for optimal monitoring.
- • **Unmatched Accuracy:** Electrochemical sensor delivers precise CO detection for your peace of mind.
- • **Power When You Need It:** Dual power source with plug-in convenience plus battery backup ensures 24/7 protection.
- • **User-Friendly Maintenance:** Front-access battery door and mute/test button simplify upkeep and nuisance alarm control.

## Overview

The First Alert CO605 is a plug-in carbon monoxide detector featuring an advanced electrochemical sensor for high accuracy. It includes a detachable power cord for versatile placement, a backlit digital display with peak level memory, and a battery backup to maintain operation during outages. Designed for easy maintenance and reliable 85dB alerts, it meets UL safety standards and offers 7 years of limited protection.

## Description

The First Alert CO605 plug in carbon monoxide alarm with battery backup uses an electrochemical carbon monoxide sensor the most accurate technology available. The alarm easily plugs into any standard outlet with no additional mounting. Battery backup ensures alarm Works even during power outages. Mute button silences any nuisance alarms. Single button also tests alarm functions. Carbon monoxide alarm utilizes electrochemical sensor for increased accuracy. 7 year limited. Co alarm meets UL standards.

Review: utterly useless, sold on desertcart as a plug in alarm suitable for U.K market, plug in not compatible with british wall sockets. needs returning to the U.S.A.
Review: The Bottom Line: This is a highly flexible carbon monoxide detector that solves the "blocked outlet" problem with its detachable cord, while providing a clear digital interface that makes monitoring straightforward. Installation & Setup: The "Dual-Power" claim isn’t just marketing; it makes installation incredibly versatile. You can plug it directly into a standard 120V outlet like a typical sensor, but the standout feature is the detachable plug. Using the included 6-foot power cord, I was able to mount the detector at eye level on the wall while plugging it into a lower outlet behind furniture. This is a huge win for accessibility and better airflow monitoring. Visibility & Interface: The backlit digital display is a major upgrade over standard "LED-only" models. It’s easy to read even in low light, displaying current CO levels and battery status at a glance. I particularly appreciate the "Peak Level" memory feature, which lets you see if any levels were detected while you were out. Safety & Reliability: Battery Backup: It uses 2 AA batteries (included), ensuring it keeps monitoring during power outages. Loud Alarm: The 85-decibel horn is piercing enough to wake you from a deep sleep or hear from another floor. Maintenance: The front-access battery door means I don't have to unplug or unmount the unit just to swap batteries. Pros: Detachable plug allows for wall mounting or direct plug-in. Clear, backlit digital display replaces confusing beep codes. Continuous monitoring with a reliable electrochemical sensor. Cons: The display does not stay lit constantly to save power, so you have to press a button to see it clearly in pitch black. Final Verdict: If you want a reliable CO detector that doesn't dictate exactly where it must be placed based on your outlet height, the First Alert CO615 is the best option in this price range.

## Features

- manufacturer: FIRST ALERT
- Item Trademark: FIRST ALERT
- Item Weight: pounds, pounds, 0.26, 0.26
- Item Category: Gas Smoke Fire Alarm

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000ND74XA |
| Department | Detecters |
| Item model number | CO606 |
| Manufacturer | First Alert |
| Product Dimensions | 8.64 x 3.51 x 12.7 cm; 119.07 g |

## Product Details

- **Brand:** First Alert
- **Colour:** white
- **Item weight:** 4.2 Ounces
- **Power source:** Battery Powered
- **Style:** Compact

## Images

![First Alert Carbon Monoxide Detector Alarm | Plug-In with Battery Backup, CO605 - Image 1](https://m.media-amazon.com/images/I/51RBX7hitxL.jpg)
![First Alert Carbon Monoxide Detector Alarm | Plug-In with Battery Backup, CO605 - Image 2](https://m.media-amazon.com/images/I/71hAwlBG2vL.jpg)
![First Alert Carbon Monoxide Detector Alarm | Plug-In with Battery Backup, CO605 - Image 3](https://m.media-amazon.com/images/I/61OVLg-kR-L.jpg)
![First Alert Carbon Monoxide Detector Alarm | Plug-In with Battery Backup, CO605 - Image 4](https://m.media-amazon.com/images/I/61pwjaHpktL.jpg)
![First Alert Carbon Monoxide Detector Alarm | Plug-In with Battery Backup, CO605 - Image 5](https://m.media-amazon.com/images/I/61b9YLStM0L.jpg)

## Questions & Answers

**Q: why does mine chirp intertmittently**
A: If it is a 9 volt battery, it may not be seated correctly.  See the video on the first alert website, and be prepared to do some hard pushing to get the 9V battery to engage.  I had 3 9V units, and 2 of the 3 seemingly required excessive pressure to get the batteries to engage.  When I first thought I had the batteries installed by just closing the door, the unit chirped until I got the batteries shoved on hard.

**Q: Will the unit work without a bettery in it?**
A: I'm putting these units into rentals.  Will this work without a battery in it?  If the battery runs low, the tenants usually take the whole unit down rather than change the battery - rendering the whole concept useless.  This is the reason I would like to invest in "plug-in" units.  However, somewhere it said it will chirp if battery is missing.  Please clarify.  I need a unit that will be effective, even without a battery installed.

**Q: Does the monitor plug directly into the wall socket or is there an electric cord?**
A: No cord. The alarm plugs in directly to the outlet.

**Q: At what level of co does this alarm sound? Thank you for your time.**
A: The following info is verbatim from the instructions that came with the unit: Actuation of the Alarm indicates the presence of carbon monoxide which can kill you.  In other words, when our CO Alarm sounds, you must not ignore it! The following is not verbatim but a summary of regulatory requirements.  Levels of CO that cause an alarm: at 400 ppm of CO, it must alarm between 4 and 15 minutes; at 150 ppm of CO, it must alarm between 10 and 50 minutes; at 70 ppm of CO, it must alarm between 60 and 120 minutes.  The unit is designed not to alarm when expose to a constant level of 30 ppm for 30 days.  Hope this has answered your question....from housewife1.

## Customer Reviews

### ⭐ Review
*by D***S on 16 December 2014*

utterly useless, sold on amazon as a plug in alarm suitable for U.K market, plug in not compatible with british wall sockets. needs returning to the U.S.A.

### ⭐⭐⭐⭐⭐ Review
*by 1***0 on 5 February 2026*

The Bottom Line: This is a highly flexible carbon monoxide detector that solves the "blocked outlet" problem with its detachable cord, while providing a clear digital interface that makes monitoring straightforward. Installation & Setup: The "Dual-Power" claim isn’t just marketing; it makes installation incredibly versatile. You can plug it directly into a standard 120V outlet like a typical sensor, but the standout feature is the detachable plug. Using the included 6-foot power cord, I was able to mount the detector at eye level on the wall while plugging it into a lower outlet behind furniture. This is a huge win for accessibility and better airflow monitoring. Visibility & Interface: The backlit digital display is a major upgrade over standard "LED-only" models. It’s easy to read even in low light, displaying current CO levels and battery status at a glance. I particularly appreciate the "Peak Level" memory feature, which lets you see if any levels were detected while you were out. Safety & Reliability: Battery Backup: It uses 2 AA batteries (included), ensuring it keeps monitoring during power outages. Loud Alarm: The 85-decibel horn is piercing enough to wake you from a deep sleep or hear from another floor. Maintenance: The front-access battery door means I don't have to unplug or unmount the unit just to swap batteries. Pros: Detachable plug allows for wall mounting or direct plug-in. Clear, backlit digital display replaces confusing beep codes. Continuous monitoring with a reliable electrochemical sensor. Cons: The display does not stay lit constantly to save power, so you have to press a button to see it clearly in pitch black. Final Verdict: If you want a reliable CO detector that doesn't dictate exactly where it must be placed based on your outlet height, the First Alert CO615 is the best option in this price range.

### ⭐⭐⭐⭐⭐ Review
*by A***R on 25 May 2019*

It arrived ahead of estimated arrival. It was well packaged and protected. This item comes very highly rated and hasn't disappointed yet.eg false alarms; dead batteries. Peace of mind at a fair price.

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*Product available on Desertcart Spain*
*Store origin: ES*
*Last updated: 2026-03-02*