These combination alarms quickly alert you to both the presence of smoke hazards and dangerous levels of carbon monoxide (CO), a poisonous gas found in many homes. CO is generated by heating and fuel-burning appliances, including fireplaces, water heaters, gas ovens, and generators, and a CO alarm should be installed on every level of your home. A combination smoke and CO detector can alert your family to both dangers, in one discrete, space-saving alarm. Choose from battery powered and hardwired smoke detector and carbon monoxide detector devices, including alarms with voice warnings to alert you to the type of danger being detected. Help protect your family with a Kidde combination smoke and carbon monoxide alarm.