Google Nest Protect Guide De L'utilisateur page 10

6. Remove your old smoke alarm
To prevent electrical shock, make sure the green
power light is off on the alarm. You may have to twist
the alarm to release it. Carefully remove it to keep
from damaging your ceiling or wall.
2
Tip: Your old smoke alarm might make a loud noise
when you disconnect it.
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7. Remove the old backplate
Unscrew the backplate from the electrical box. Save
the screws to install the Nest Protect backplate later.