A carbon monoxide detector is a safety device designed to detect the presence of carbon monoxide (CO) gas in the air. CO is a colorless, odorless gas produced by burning fossil fuels, and it can be harmful or even fatal in high concentrations. The detector alerts occupants with an alarm when it senses dangerous levels of CO, allowing them to take action and evacuate if necessary. These detectors are typically installed in homes, especially near sleeping areas, to ensure that people are alerted while they sleep. Regular maintenance, such as testing the alarm and replacing batteries, is essential for effective operation.