Kidde Firex™ I4618 AC/DC Smoke Alarms (Ionization)

I4618's require a 120 VAC power source and come with 9V battery backups. Alarm is interconnectable with up to 24 devices, of which 18 can be initiating including smoke, CO, strobe light, and heat alarms. It also uses ionization technology for excellent fast-flaming fire detection. Other features include a Smart Hush? button, front-loading battery door, and alarm memory indicator. 5-year warranty.