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- Detects carbon monoxide, a colorless, odorless, deadly gas that poses a potentially deadly health risk to people.
- Measures the amount of carbon monoxide over time and sounds an alarm before people would experience symptoms.
- Operates on batteries or can be plugged in.
- Some models provide a running digital readout of CO levels.
- Hard-wired or plug-in models typically use some type of solid-state sensor, which purges itself and resamples the air periodically. That cycle increases the power demand.
- Battery-powered detectors typically use a passive sensor. They will operate even in case of a power failure.
- Available in combination units that have CO and smoke detectors in the same unit.