First Alert CO400 Carbon Monoxide Detector | Battery Operated 6-Pack (White)

The First Alert CO400 Carbon Monoxide Detector is a practical, battery-powered solution designed for simple, dependable protection across your home. This 6-pack brings flexible coverage and peace of mind, with each alarm ready to go right out of the box after you insert the included 9-volt battery. The compact white units blend discreetly into most rooms, so you can place one on every level and in bedrooms without sacrificing style.

Smart sensing, clear alerts

Each detector uses an advanced electrochemical sensor to monitor carbon monoxide levels, providing real-time notifications when CO is detected in the space. It’s designed to respond to common scenarios such as aging or faulty fuel-burning appliances, blocked chimneys, and generators operated indoors or near interior doors. When levels rise, the unit emits a loud 85-decibel alarm to help you notice the threat even while you sleep or during busy moments around the house.

Simple setup, ongoing awareness

• Battery-powered operation ensures continuous monitoring even during power failures.
• End-of-life timer clearly indicates when a replacement is needed, helping you stay proactive.
• One-button silences or tests the unit for straightforward maintenance.

• Include one detector on each level of the home and in every bedroom for more complete coverage.
• Easy to install in minutes—no wiring or electrician required; just insert the supplied 9-volt battery and place where you need protection.
• Designed to fit naturally with home interiors, while maintaining strong, reliable performance.

In everyday life, this six-pack works well for multi-room households, renovators, or renters who want flexible safety solutions without complex installations. It’s a practical option for homes with fuel-burning appliances, fireplaces, or portable generators used during outages. While no device can guarantee results, using multiple detectors across the home helps you stay informed and prepared to respond if CO is detected, should the situation arise.

What you gain

Beyond the alarm itself, the CO400 family emphasizes user-friendly maintenance, clear audible alerts, and dependable coverage. The included batteries support immediate setup, and the one-button control minimizes nightly disruptions while keeping you in control of testing and silencing as needed. This setup can align with a room-by-room safety routine that fits a busy household, giving everyone a straightforward way to stay attentive to CO presence across the home.