The Kidde KN-COSM-XTR-B uses breakthrough technology to offer a fast response to real fires, including smoldering and fast-flaming, as well as protecting you from carbon monoxide and dramatically reducing the chance of nuisance alarms. In addition, this intelligent alarm contains a voice warning that clearly states the present danger, smoke or carbon monoxide, and announces "Fire! Fire!" or "Warning Carbon Monoxide." It combines the detection capabilities of an ionization smoke sensor which is more likely to detect smaller, less visible fire particles, like those produced by flaming fires with that of an electrochemical sensor, which is used to detect CO. Since carbon monoxide is present in all fires, having both detection chambers work together in one alarm is a breakthrough in the fire safety industry. When either sensor notices a potential hazard, it will communicate with the other. Depending on what is detected, the alarm will adjust its smoke sensitivity in order to better discriminate between a real hazard and a false one. This constant communication enhances the alarm"s overall performance in all fires, and significantly reduces the potential for a nuisance alarm.