--- product_id: 289635423 title: "Carbon Monoxide Detector Alarm | Plug-In with Battery Backup, CO605" brand: "first alert" price: "$86.89" currency: USD in_stock: true reviews_count: 5 url: https://www.desertcart.us/products/289635423-carbon-monoxide-detector-alarm-plug-in-with-battery-backup-co605 store_origin: US region: United States of America --- # Backlit digital display with peak memory Battery backup for power outage safety Detachable plug for flexible mounting Carbon Monoxide Detector Alarm | Plug-In with Battery Backup, CO605 **Brand:** first alert **Price:** $86.89 **Availability:** ✅ In Stock ## Summary > 🚨 Stay ahead of danger with smart, flexible CO protection! ## Quick Answers - **What is this?** Carbon Monoxide Detector Alarm | Plug-In with Battery Backup, CO605 by first alert - **How much does it cost?** $86.89 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/289635423-carbon-monoxide-detector-alarm-plug-in-with-battery-backup-co605) ## 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: Great product - These are great monitors. They came highly recommended by my fire department nearby. This 3pk. buy worked great because of the size of home, the people I was buying it for. Review: Works Awesome - Great Product! Fast Shipping! ## 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 | | Alarm | Audible | | Brand | First Alert | | Built-In Media | Alarm, Battery | | Color | white | | Colour | white | | Customer Reviews | 4.7 out of 5 stars 27,373 Reviews | | Enclosure Material | Plastic | | Global Trade Identification Number | 00029054000682 | | Item Type Name | CO Alarm | | Item Weight | 4.2 Ounces | | Item weight | 4.2 Ounces | | Manufacturer | First Alert | | Mfr Part Number | FATCO605 | | Model Number | CO606 | | Number of Items | 1 | | Power Source | Battery Powered | | Power source | Battery Powered | | Product Style | Compact | | Sensor Type | Electrochemical | | Style | Compact | | UPC | 029054000682 | | Unit Count | 1.0 Count | ## Product Details - **Brand:** First Alert - **Colour:** white - **Item weight:** 4.2 Ounces - **Power source:** Battery Powered - **Style:** Compact ## Images ![Carbon Monoxide Detector Alarm | Plug-In with Battery Backup, CO605 - Image 1](https://m.media-amazon.com/images/I/51RBX7hitxL.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 ### ⭐⭐⭐⭐⭐ Great product *by J***E on 13 December 2025* These are great monitors. They came highly recommended by my fire department nearby. This 3pk. buy worked great because of the size of home, the people I was buying it for. ### ⭐⭐⭐⭐⭐ Works Awesome *by A***R on 2 May 2026* Great Product! Fast Shipping! ### ⭐⭐⭐⭐⭐ Carbon Minoxide Alert *by J***I on 3 August 2025* Ended up getting this sooner than expected. It is so easy to ready and replace the old one. Very happy with it. ## Frequently Bought Together - First Alert CO605 Plug-In Carbon Monoxide Detector with Battery Backup , White - Kidde Carbon Monoxide Detector, Battery Powered CO Alarm with LEDs, Test-Reset Button, Low Battery Indicator, Portable - Kidde Carbon Monoxide Detector, Plug In Wall with AA Battery Backup, Test-Hush Button --- ## 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.us/products/289635423-carbon-monoxide-detector-alarm-plug-in-with-battery-backup-co605](https://www.desertcart.us/products/289635423-carbon-monoxide-detector-alarm-plug-in-with-battery-backup-co605) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-07-15*