With the "Drive Kit Plus for the iPhone®" your iPhone® 4/4S is fully
integrated in the CLA-Class. It is integrated through the interaction of the Mercedes-Benz app called "Digital DriveStyle" with the "Drive Kit Plus for the iPhone®" interface in the vehicle, where the iPhone® is connected and charged.
The "Digital DriveStyle" app is available free of charge at the iTunes® App Store . In the app, extensive functions are seamlessly integrated in the new revolutionary user interface and shown on the vehicle display  . With the iPhone® connected, the "Digital DriveStyle" app is reliably and conveniently controlled via the ergonomically designed Controller.
Some of the functions of the "Digital DriveStyle" app:
 "Digital DriveStyle" app available in the iTunes® App Stores in Germany, France, Italy, UK, Luxembourg, Netherlands and Switzerland. Additional countries will follow.
 In conjunction with Audio 20 CD or COMAND Online.
 Only audio support.A list of Siri commands is available at http://digitaldrivestyleapp.com
 Languages: German, English, Italian, French, Spanish, Dutch, Danish, Swedish, Norwegian, Finnish, Portuguese.