The C Series carbon monoxide alarms are for use as evacuation devices in all dwelling units, including but not limited to homes, apartments, hospitals, hotels and motels. Available in 2 different models, the C Series is engineered to virtually eliminate nuisance alarms and deliver outstanding performance wherever reliable carbon monoxide detection is required. The SC Series multi-criteria combination smoke and carbon monoxide alarms are for use as evacuation devices in all dwelling units, including but not limited to homes, apartments, hospitals, hotels and motels. Available in several different models, the SC Series is engineered to virtually eliminate nuisance alarms and deliver outstanding performance wherever reliable fire and carbon monoxide protection are required. The C Series alarms are ANSI/UL 2034 Listed.