The Kidde i12040 is an AC/DC powered, ionization smoke alarm that operates on a 120V power source with 9V battery backup.
This alarm uses ionization sensing technology. Ionization sensing alarms may detect invisible fire particles (associated with flaming fires) sooner than photoelectric alarms. Photoelectric sensing alarms may detect visible particles (associated with smoldering fires) sooner than ionization alarms.
This unit is a UL Listed product with a 10-year limited warranty.