The Kidde 2106377 Combination Carbon Monoxide and 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 HushTM 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 includes 9V battery backup providing protection even during a power outage when many incidences occur. The 2106377 is an easy to install alarm that is suitable for all living areas. It has a 7-year life and a 5-year limited warranty.