Kidde Talking Carbon Monoxide & Smoke Alarm - This home alarm is designed to warn you against two types of life-threatening dangers. Smoke and Carbon Monoxide. However with dual detection, how will you know what has been detected if the alarm goes off? Well, Kidde has included a voice warning to avoid any such confusion. A clear and loud voice will let you know if there's a fire or high carbon monoxide readings. It'll even tell you if your backup battery is low! Power Source: 120VAC, 60Hz 25mA max per alarm | Low Battery Warning | Electrochemical Sensor | Test Button |Battery Backup Powered by 3 AA batteries (included) | 5-Year Limited Manufacturer's Warranty