The First Alert CO400 uses an electrochemical carbon monoxide sensor to detect CO, the colorless and odorless gas produced by furnaces, water heaters, fireplaces and engines. Because it runs on batteries it keeps working during a power outage and can be moved from room to room or taken along when you travel.

• Electrochemical CO sensor detects carbon monoxide
• Battery operated - portable and works during a power outage
• Loud 85-decibel alarm sounds when CO levels are elevated
• Single test/silence button for simple operation
• Color: White

Note: Install a CO alarm on every level of the home and near sleeping areas per local codes.