10-Year Worry Free Sealed Battery Smoke Detector with Ionization Sensor (3-Pack)This Kidde 10 Year smoke detector is easy to install and alerts your family when fire or smoke is detected in your home. Smoke alarms should be placed outside each sleeping area and on every level of the home. This alarm is powered by a 10 Year sealed in, non replaceable lithium ion battery. No hardwire installation required and no need to change the batteries over the 10 year life of the alarm. Simply replace the entire unit after 10 years. Smoke