Switch Off; Operation - Nokia CK-100 Manual

ENGLISH
If the ignition sense wire is not connected, press and hold the Navi
wheel for about 2 seconds. Alternatively, turn on the ignition, start
driving, and wait until the built-in motion sensor switches the car kit
on automatically.

Switch off

If the ignition sense wire is connected, turn off the car ignition.
If the ignition sense wire is not connected and you are not using your
phone connected to the car kit for calling, close the Bluetooth
connection to your phone and music device.
After you turn off the car ignition, do not leave your mobile phone or
music device connected to the car kit to prevent accidental draining of
the car battery.

Operation

Calls
To make a call, use your mobile phone in the normal way when the
car kit is connected to it.
To redial the number you last called (if your phone supports this feature
with the car kit), press the Navi wheel twice when no call is in progress.