Followed the "User's Manual" that came with it. It was a breeze to install. Installed the batteries, make sure to turn the batteries around with +/- terminals facing inside. Per manual tested the batteries, "Pushed and held test button until the alarm sounded: 3 beeps, pause, 3 beeps, pause." Removed the old detector, loosened the two screws that held the old plate and removed it, installed new plate and used the adapter that suited my installation.
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