--- product_id: 7590480 title: "First Alert Hardwire Carbon Monoxide Alarm | CO5120BN BRK, 9V Battery Backup" brand: "first alert" price: "€ 96.82" currency: EUR in_stock: true reviews_count: 8 category: "First Alert" url: https://www.desertcart.hr/products/7590480-first-alert-hardwire-carbon-monoxide-alarm-co5120bn-brk-9v-battery store_origin: HR region: Croatia --- # 120V hardwired power Interconnects up to 18 devices 9V battery backup First Alert Hardwire Carbon Monoxide Alarm | CO5120BN BRK, 9V Battery Backup **Brand:** first alert **Price:** € 96.82 **Availability:** ✅ In Stock ## Summary > 🚨 Stay ahead of danger with smart, seamless CO protection! ## Quick Answers - **What is this?** First Alert Hardwire Carbon Monoxide Alarm | CO5120BN BRK, 9V Battery Backup by first alert - **How much does it cost?** € 96.82 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/7590480-first-alert-hardwire-carbon-monoxide-alarm-co5120bn-brk-9v-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 - • **User-Friendly Control:** One-button test/silence function for quick checks and easy nuisance alarm silencing. - • **Smart Networked Alerts:** Interconnect up to 12 alarms + 6 compatible devices for whole-home CO coverage. - • **Precision Detection Tech:** Advanced electrochemical sensor with microprocessor control minimizes false alarms. - • **Seamless Hardwired Integration:** Plug-and-play 120V connection for effortless, electrician-free installation. - • **Uninterrupted Safety Assurance:** Reliable 9V battery backup keeps you protected even during power outages. ## Overview The BRK CO5120BN is a hardwired carbon monoxide detector featuring a 120V plug-in power system with a 9V battery backup for continuous protection. It uses an advanced electrochemical sensor and microprocessor to accurately detect CO while reducing false alarms. Interconnectable with up to 18 devices, it offers comprehensive home safety with tamper-resistant design and easy one-button testing and silencing. ## Description desertcart.com The BRK hardwire carbon monoxide alarm detects dangerous CO gas and allows you peace of mind with its battery backup. Carbon monoxide (CO) is a colorless, odorless, deadly gas. It can be emitted by sources including gas or oil furnaces, gas clothes dryers, water heaters, fireplaces, wood stoves, charcoal grills, gas ranges, and space heaters. A clogged chimney, improper venting, and attached garages can also cause carbon monoxide accumulation. According to the Consumer Product Safety Commission (CPSC), at least one CO alarm should be installed near a home's sleeping area. This BRK alarm is perfect for bedrooms, as well as hallways, and basements. The BRK CO5120BN hardwire CO alarm with battery backup includes these features: Quick plug-in power connector for easy installation. 120-volt AC inter-connectable (with maximum 18 compatible devices). The alarm can be interconnected with up to 12 other compatible smoke alarms and six compatible devices like bells, horns, repeaters and door closers. If one unit triggers an alarm, all smoke alarms in the series will sound. Power indicators show which unit in the series initiated the alarm. Microprocessor controlled for fewer nuisance alarms. Single test/silence button which both silences a non-threatening alarm or low battery warning and allows you to test the unit's functionality. Automatically performs internal test of functionality. Latching alarm indicator which automatically identifies which unit initiated the alarm. Battery drawer lock and mounting bracket lock for tamper resistance. AC power indicator and alarm indicator light. Low battery warning "chirp" and missing battery tab. Swing open battery drawer for easy battery installation. 9-volt battery backup for peace of mind during power outages. All BRK Electronics carbon monoxide alarms are listed to UL Safety Standard 2034 for residential carbon monoxide alarms. Includes 9-volt backup battery. 5-year limited warranty.--Bree NorlanderWhat's in the Box One carbon monoxide alarm, one 9-volt battery, and user's manual Product Description Get alerted to dangerous carbon monoxide leaks with the First Alert CO5120BN Hardwired Carbon Monoxide Alarm with Battery Backup. This carbon monoxide detector uses an advanced electrochemical carbon monoxide sensor that accurately detects elevated CO levels and comes equipped with a microprocessor that helps minimize false alarms. The alarm's plug in power connector makes installation quick and easy, while its tamper resistant mounting bracket lock keeps the alarm secure. Featuring a 9 volt battery backup, this unit is designed to offer seamless detection, even in the event of a power outage. An 85 decibel horn sounds if carbon monoxide levels are too high, and a warning chirp notifies you when the battery needs to be replaced. This carbon monoxide alarm can integrate with up to 12 other First Alert or BRK hardwired alarms and up to six other compatible devices such as bells, horns, and repeaters making it ideal for comprehensive coverage of large households or facilities. A latching alarm indicator automatically identifies which unit in the series triggered the alarm. And thanks to the convenient test/silence button, the alarm can be checked easily to ensure it is functioning properly and false alarms can be muted easily. Review: Great product - I ordered this product to replace my old one. It was easy to install, and I just had to plug it in. I did not require an electrician. Review: Easy to set up and use - This was a replacement of a previous purchased First Alert detector and it fit perfectly. I just attached the wires and it worked right away. ## Features - plastic - Imported - Plastic - 120 volt hard wired carbon monoxide alarm wires directly into your home's electrical system - Electrochemical sensor accurately detects carbon monoxide - Microprocessor controlled to minimize false alarms ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B000H2673K | | Alarm | Audible | | Best Sellers Rank | #19,187 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #23 in Carbon Monoxide Detectors | | Brand | First Alert | | Built-In Media | FIRST ALERT BRK CO5120BN Hardwired Carbon Monoxide (CO) Detector with Battery Backup , White | | Color | White | | Customer Reviews | 4.6 out of 5 stars 1,441 Reviews | | Enclosure Material | Plastic | | Global Trade Identification Number | 00029054856173 | | Item Dimensions D x W x H | 2.09"D x 5.53"W x 5.72"H | | Item Type Name | FIRST ALERT BRK CO5120BN Hardwired Carbon Monoxide (CO) Detector with Battery Backup , White | | Item Weight | 0.55 Pounds | | Manufacturer | BRK Brands | | Manufacturer Warranty Description | Warranty | | Mfr Part Number | GID-601054 | | Model Number | CO5120BN | | Number of Items | 1 | | Operating Humidity | 10-95% RH | | Power Source | Battery Powered | | Product Dimensions | 2.09"D x 5.53"W x 5.72"H | | Product Style | Safety | | Sensor Type | Electrochemical | | Style | Safety | | UPC | 029054856173 | | Unit Count | 1.0 Count | ## Product Details - **Alarm:** Audible - **Brand:** First Alert - **Color:** White - **Global Trade Identification Number:** 00029054856173 - **Item Weight:** 0.55 Pounds - **Operating Humidity:** 10-95% RH - **Power Source:** Battery Powered - **Product Dimensions:** 2.09"D x 5.53"W x 5.72"H - **Sensor Type:** Electrochemical - **Style:** Safety ## Images ![First Alert Hardwire Carbon Monoxide Alarm | CO5120BN BRK, 9V Battery Backup - Image 1](https://m.media-amazon.com/images/I/61oVRUYntvL.jpg) ## Available Options This product comes in different **Pattern, Color, Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great product *by S***R on April 13, 2026* I ordered this product to replace my old one. It was easy to install, and I just had to plug it in. I did not require an electrician. ### ⭐⭐⭐⭐⭐ Easy to set up and use *by J***F on January 31, 2026* This was a replacement of a previous purchased First Alert detector and it fit perfectly. I just attached the wires and it worked right away. ### ⭐⭐⭐⭐⭐ Great replacement *by A***R on March 18, 2026* Exactly what I needed to replace what I had . ## Frequently Bought Together - FIRST ALERT BRK CO5120BN Hardwired Carbon Monoxide (CO) Detector with Battery Backup , White - BRK First Alert 9120BFF/ SMI100-AC Smoke Detector, Hardwired Alarm with Battery Backup, White, 1-Pack - First Alert BRK 9120Bff-6 Hardwired Smoke Detector with Battery Backup, 6-Pack --- ## 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.hr/products/7590480-first-alert-hardwire-carbon-monoxide-alarm-co5120bn-brk-9v-battery](https://www.desertcart.hr/products/7590480-first-alert-hardwire-carbon-monoxide-alarm-co5120bn-brk-9v-battery) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-07-26*