Thnks ! I was able to interconnect my new first alert alarms with my existing FA alarms by watching your video. I couldn’t figure out the manual instructions at all 😅
I am interested in smoke alarms especialy interconnected because in my country we dont have forced any by law in residental buildings it denends on owner decisions to have some. It's forced by law in commercial buildings and from 2008 in new buildings or after rebuild that need approval so smoke alarms are relatively rare thing for us.