Visual difference between smoke and carbon monoxide detectors

Visually, smoke detectors are typically round, labeled “Smoke Alarm,” and mounted on ceilings, while carbon monoxide detectors are often rectangular or plug-in units labeled “CO Detector” or “Carbon Monoxide Alarm.” For easy identification, CO detectors may feature a digital display showing carbon monoxide levels, something smoke detectors don’t usually have. Knowing the difference helps ensure you’re using the right detector for fire and gas safety.