Kidde PI9000CA User Manual page 12

Operation
Alarm Tamper-Resist Feature
This alarm has a tamper-resist feature. This feature will
help deter children or others from removing the alarm
from the mounting plate.
Activate the tamper-resist feature by breaking off the four
posts in the square holes in the mounting plate (see Image 5A).
Rotate the alarm onto the mounting plate until you hear
the tamper-resist tab snap into place, locking the alarm. To
remove the alarm, press on the tamper resist tab and
rotate the alarm off the mounting plate.
LOCATION
OF POSTS
A
IMAGE 5A
IMAGE 5C
11
A
IMAGE 5B
IMAGE 5D