Unlock the alarm mounting plate by turning the the plate counterclockwise, then remove.
Align the mounting plate with the junction box that was previously constructed by a licensed contractor. Gently pull the capped wires that create the connector plug through the center hole of the mounting plate.
Use a screwdriver to secure the mounting plate to the junction box, using the screws that are included with the manufacturer's packaging. The junction box will have slots for the screws and no drilling is required.
Connect the wire connector by aligning the plug to the pins on the back of the alarm and pressing down firmly. Align the alarm to the mounting plate and turn clockwise to secure.
Test the alarm by pressing the "Push-to-Test" button for five seconds. The smoke alarm will sound four beeps each second for up to 10 seconds to indicate that the alarm has been installed properly.