First Alert BRK CO5120BN: Hardwired Carbon Monoxide Alarm with Battery Backup

Overview

The First Alert BRK CO5120BN hardwired carbon monoxide alarm brings steady CO monitoring to spaces where families live and sleep. It plugs into your home's 120 V electrical system and adds a 9 V battery backup, helping keep warning signals audible even during a power outage.

Designed for bedrooms, hallways, and basements, this detector offers confident, room-to-room coverage when you need it most. As a UL listed residential CO alarm, it integrates into a larger safety network with compatible devices and other First Alert or BRK alarms.

Smart sensing and practical operation

A modern electrochemical sensor detects carbon monoxide levels with precision, while a microprocessor reduces nuisance alarms. The test/silence button lets you quickly confirm function or mute non threatening alerts without unnecessary fuss. An automatic internal self test keeps you informed about system status.

• Interconnect up to 12 alarms and up to six devices for coordinated home alerts
• 85 dB horn provides a clear, room filling warning
• Latching alarm indicator shows which unit started the alarm
• Tamper resistant mounting bracket locks and a secure battery drawer help deter tampering

Installation, maintenance, and reliability

The quick plug-in power connector makes installation fast, and the 120-volt interconnect capability supports broad coverage across multiple rooms or levels. A 9V backup battery keeps detection active during outages, while the unit’s self test and battery status indicators simplify ongoing maintenance.

• Easy 120 V hard wired installation
• Interconnects with up to 18 devices total (12 alarms plus 6 accessories)
• Self test and status indicators help you stay informed

In daily use, the audible alarm and the visual indicators guide you toward prompt response without overwhelming you with false alarms. This CO detector is a practical choice for bedrooms, hallways, and basements, especially in homes with multiple rooms or complex heating setups. For added confidence, the device carries UL 2034 listing and a five year limited warranty.