This Legislation Alarm comes in a 6 pack and has special pricing and is only able to be sold in certain states. It is a Kidde Combination Carbon Monoxide & Smoke Alarm that provides two important safety devices in a single unit. The 900-0102 combination alarm includes a voice warning system that announces "Fire, Carbon Monoxide or Low Battery". The voice alarm eliminates any confusion and clearly warns you and your family of a smoke or carbon monoxide danger. This battery operated technically advanced combination alarm provides protection even during a power outage when most incidences occur.