These interconnected smoke and carbon monoxide detectors are an important safety feature in a home with multiple levels, although stand-alone detectors may be adequate for a small, single-level home.

NFPA 101 recommends CO alarms in homes with fuel-burning appliances or attached garages, with detectors placed near sleeping areas and on every occupiable level.

Carbon Monoxide is often called a silent killer because of its invisible, odorless nature. That makes installing a Carbon Monoxide detector even more critical. Here are CNET's top picks.