Honeywell Home CO605B Carbon Monoxide Plug-In Alarm with Battery Backup Overview

5800 Series smoke, heat, or CO wireless life-safety transmitter — supervised fire/CO zone on compatible panels (5800CO, 5800COMBO, smoke SKUs).

Life-safety devices have stricter placement and testing requirements than burglary sensors. Follow NFPA/local code, use professional monitoring where required, and never substitute takeover modules for fire or CO hardwire.

At a Glance

What This Device Does Well

Provides reliable supervised status at the panel and Total Connect 2.0 when installed, enrolled, and range-tested correctly.

Before You Service or Replace One

• Device age — smoke/CO sensors expire; replace per label date.
• Zone type — fire vs burglary programming differs; do not bypass without authority.
• FireFighter placement — acoustic path to standalone smoke alarms.
• Monitoring — central station fire test procedures for monitored accounts.

Official Sources

• Resideo product page
• User Manual for CO606 Carbon Monoxide Plug-In Alarm (English, Spanish)
• CO606 ETL Listing Card
• CO605B Specification Sheet

Use official Resideo install PDFs and install guides for exact wiring, enrollment, and firmware — specifications vary by SKU and region.