The BRK Brands . Inc. model No SCO2 is a battery powered single station combination smoke and carbon monoxide alarm specifically designed for residential and institutional applications including sleeping rooms of hospitals . hotels . motels . dormitories and other multi-family dwellings as defined in standard NFPA 101 Model SCO2 complies with UL217 . UL2034 . CSFM . NFPA 72 . NFPA 720 . HUD . FHA and other agencies that model their codes after the above agencies. They meet building codes where battery powered smoke and carbon monoxide alarms are required either separately or in combination.