The Danbury Fire Department is alerting residents to a recall of smoke and carbon monoxide alarms from Universal Security Instruments.  The 2-in-1 Photoelectric Smoke & Fire + Carbon Monoxide Alarms can fail to alert consumers to the presence of a hazardous level of carbon monoxide.  The odorless, colorless, poisonous gas can lead to illness or death.  The company received two reports of units that failed to alarm for the presence of CO within the specified time requirement. No injuries have been reported.  They were sold nationwide and online at Walmart-dot-com and other websites from June 2017 through December 2019 for between $50 and $80.