Protect your family with the Kidde Code One Smoke Detector, Battery Powered with Ionization Sensor, Smoke Alarm. The Kidde Code One Smoke Detector, Battery Powered with Ionization Sensor, Smoke Alarm operates on one, 9-volt, alkaline battery. Using ionization sensing technology, the Kidde Code One Smoke Detector, Battery Powered with Ionization Sensor, Smoke Alarm alerts to invisible fire particles, even during power outages and also provides a low battery warning when the battery needs to be replaced. After 10 years of use, the Kidde Code One Smoke Detector, Battery Powered with Ionization Sensor, Smoke Alarm will need to be replaced. UL Certified with a 10-year limited warranty. Meets requirements of UL 217 NFPA 72, The California State Fire Marshall, MFPA 101, and FHA.