Kidde Combination Smoke and CO Alarm is battery-powered combination alarm that offers protection from the dual dangers of smoke and carbon monoxide in a single unit for added convenience – the voice alarm feature audibly announces which danger has been detected. Designed to be wall- or ceiling-mounted, this battery-powered unit is perfect for when space is limited but protection is paramount. It can be used in most locations throughout the home but check in in-pack guidelines for specific installation instructions.