I replaced all 5 of my detectors. The plug was not compatible, so shut the power off and just replaced the plug one wire at a time (white to white, black to black and the red to the last wire, red or yellow). I used 10 year units, meaning they have a ten year built in battery. Now as I get older I won't have to worry about getting up on a latter for ten years, at which point I'll hire someone to place them then.
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