The Kidde 900-0102 combination carbon monoxide & smoke alarm provides two important safety devices in a single unit. This alarm includes a voice warning system that announces fire, carbon monoxide, low battery or Smart Hush activation. The voice alarm eliminates any confusion and clearly warns you and your family of a smoke or carbon monoxide danger, or if your battery is in need of replacement. This technically advanced combination alarm is battery operated protecting you and your family even during a power outage when many incidences occur. The 900-0102 is an easy to install alarm that is suitable for all living areas and has a 5 year limited warranty.