Brk co400b Carbon Monoxide Alarm 9V Battery Operated

Product Description

The BRK co400b is a 9-volt battery-operated carbon monoxide alarm designed for residential installation. It uses an electrochemical CO sensor, widely regarded as the most accurate sensing technology available for this application. The unit produces an 85 dB audio alarm at 10 feet and includes a rapidly flashing red indicator light when CO is detected. A front-access battery compartment simplifies servicing without removing the unit from its mounting location. The co400b is suitable for installations that must meet state and local carbon monoxide alarm codes.

The co400b is intended for residential use in homes, apartments, and similar occupancies where a standalone, battery-powered CO alarm is required by code. Because it operates entirely on a 9-volt alkaline battery, it requires no hardwire connection and can be placed in locations where AC wiring is not available or practical. The operating temperature range of 40 degrees F to 100 degrees F and a humidity range of 10 to 90 percent RH makes it suitable for typical interior living spaces.

Key Features

• Electrochemical CO sensor for accurate carbon monoxide detection
• 85 dB audio alarm at 10 feet with four-beep, pause, four-beep pattern
• Front-access battery compartment for easy battery replacement without dismounting
• Single-button Test/Silence function electronically simulates CO conditions to verify operation
• Two silence modes: suppresses low-battery chirp for up to eight hours or temporarily clears nuisance alarms
• End-of-life signal provides audible notification when the unit requires replacement
• 7-year limited warranty

Compatibility

Designed as a standalone battery-operated carbon monoxide alarm for residential occupancies requiring compliance with state and local CO alarm codes.

Installation Notes

Installation is typically performed by a licensed electrician or qualified contractor, though many jurisdictions permit homeowner installation of battery-only CO alarms. Follow NFPA 720 and applicable local codes for placement height and room-coverage requirements. No hardwire or low-voltage connections are required for this unit. Test the alarm immediately after installation and replace the 9-volt alkaline battery according to the manufacturer schedule.

Technical Specifications

• Operating Voltage: 9V Alkaline Battery
• Audio Alarm: 85 dB at 10 feet
• CO Sensor Type: Electrochemical
• Temperature Range: 40 degrees F (4 degrees C) to 100 degrees F (38 degrees C)
• Humidity Range: 10% to 90% relative humidity (RH)
• Dimensions: 3.3 inches H x 4.8 inches L x 1.5 inches D
• Weight: 0.34 pounds
• Alarm Reset: Automatic when CO clears
• Warranty: 7-Year Limited

Standard Information

• Brand: BRK
• Manufacturer Part Number: co400b