Expand An Interconnected Smoke Alarm System Without Extra Wiring! Wireless AC Powered Smoke Alarm From Kidde https://www.youtube.com/watch?v=DBVODwRdFOs When one alarm sounds they all do Interconnect without wires – simply replace one interconnected smoke alarm with the Kidde Wireless AC powered alarm Install in minutes, anywhere in the home Less cost and less hassle than re-wiring