Full Details from Amazon.com : http://www.amazon.com/gp/product/B00ECX0VVY?tag=onigi-20<br /><br />Kidde KN-COPE-I AC Wire-in Combo CO/Photo Smoke Alarm (21007624)<br /><br />AC-Wire with battery backup An included 9V battery protects during short-term power outages <br />Front-loading battery with unique battery door design <br />Voice Warning with Green and Red LEDs <br />Photoelectric smoke sensor - May detect visible fire particles associated with slow smoldering fires sooner than an ionization sensor <br />Tamper resistant
