First Alert Plug-In Carbon Monoxide Alarm CO606 — Electrochemical Sensor, Battery Backup

The First Alert Plug-In Carbon Monoxide Alarm CO606 is a simple plug-in CO detector with electrochemical sensing and battery backup that continuously monitors and sounds an 85 dB alert if carbon monoxide levels become unsafe.

This compact CO alarm is designed for easy, dependable protection in homes and small spaces. Plug the unit into any standard 120-volt outlet and it begins monitoring immediately; the built-in electrochemical sensor provides accurate detection while the included battery backup keeps the alarm active during power outages. With a single test/silence button, an end-of-life signal, and UL-tested construction, the CO606 prioritizes straightforward operation and long-term reliability.

How does the First Alert CO606 detect carbon monoxide?

The CO606 uses an electrochemical sensor, which responds to carbon monoxide molecules and provides reliable detection across a range of concentrations. This sensing technology is commonly used in life-safety devices because it is selective to CO and performs consistently over time.

• Electrochemical sensor tuned for carbon monoxide response
• Continuous monitoring when plugged into a 120-volt outlet
• Battery backup maintains protection during power loss
• End-of-life chirp signals when the unit needs replacement

Where should I place these plug-in CO alarms in my home?

Place one alarm on every level of your home and inside each bedroom to achieve complete coverage. Because the unit plugs directly into outlets, choose central locations away from cooking appliances and enclosed closets to avoid false triggers and ensure airflow around the sensor.

• Install on each floor and in all sleeping areas
• Plug into a central, unobstructed outlet—avoid behind furniture
• Keep away from stoves and garages to reduce nuisance alerts
• Use room placement to ensure quick occupant notification

What features help me maintain and test the alarm?

Maintenance is minimal: a single button both tests the unit and silences non-emergency alerts, while the end-of-life signal tells you when the alarm should be replaced. First Alert backs the CO606 with a seven-year limited warranty and UL-standard testing for dependable operation.

• One-button test/silence for straightforward checks
• End-of-life chirp indicates replacement time
• 7-year limited warranty for manufacturing coverage
• UL-tested for safety and performance standards

How loud is the alarm and how will it alert my household?

The CO606 emits an 85-decibel alarm at detection thresholds, loud enough to be heard throughout typical residential rooms. The audible signal is complemented by a clear, easy-to-recognize chirp for end-of-life notifications so you know when the device needs replacing or testing.

• 85 dB alarm alerts occupants to elevated CO levels
• Distinct end-of-life chirp for timely replacement reminders
• Immediate alarm response when CO concentrations reach set thresholds
• Simple silence button to stop nuisance alerts temporarily

Who is this for? The First Alert CO606 plug-in carbon monoxide alarm is ideal for homeowners, renters, and landlords seeking an easy-to-install CO detection solution. It fits in living rooms, bedrooms, basements, and hallways where standard outlets are available, and is well suited for anyone who wants minimal upkeep, battery-backed protection during outages, and a straightforward test/silence interface. For full coverage, install one on each level of your home and inside sleeping areas.