Mercedes-Benz 2016 SLK Operator's Manual page 94

Roof
92
Operating MAGIC SKY CONTROL
Turn the SmartKey to position 1 or 2 in the
X
ignition lock.
MAGIC SKY CONTROL switches to the sta-
tus it was set to before the engine was
switched off.
To change the degree of transparency:
X
press button :.
At sub-zero temperatures, the change is
slower and uneven. The entire process may
take some time.