The Kidde Front-Loading Smoke and Carbon Monoxide alarm (part# CP9000) offers protection from two hazards – fire and CO – in one unit. This 9-volt battery-powered alarm emits a beeping tone followed by a voice warning that clearly announces the danger by saying, “Fire! Fire!" or “Warning! Carbon Monoxide!" The uniquely designed front-loading battery compartment makes battery replacement quick and easy, and ensures proper installation. Manufactured with a photoelectric sensor for detecting smoke and fire, this alarm also includes the world’s most accurate CO sensing technology based on claims by major manufacturers.