- Easy to use: The CO400 is designed to be easy to use, with a simple test/silence button that allows you to test the alarm and silence it if necessary. It also has a low battery warning, so you'll know when it's time to replace the batteries.
- Affordable: The First Alert CO400 Carbon Monoxide Detector is an affordable option for protecting your home from the dangers of carbon monoxide. It's a small investment that can provide peace of mind and potentially sa

The First Alert CO400 Carbon Monoxide Detector is a reliable and easy-to-use device that helps protect your home and family from the dangers of carbon monoxide. This battery-operated alarm is designed to detect CO levels in your home and emit a loud, 85-decibel alarm to alert you to the presence of this invisible, odorless gas. The CO400 features an electrochemical sensor that is highly sensitive and accurate, ensuring that you are alerted to even low levels of CO. With a compact and sleek design, this detector can be easily installed in any room of your home, and its battery-powered operation means you don't have to worry about wiring or power outlets. Whether you're a homeowner or a renter, the First Alert CO400 Carbon Monoxide Detector is an essential tool for keeping your home and loved ones safe.

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