1. Activate by OBD2 Plug and Play, Easy to use. 2. Connect mobile phone with car only via cable. 3. Support Apple Carplay and Android Auto. (Android Auto only support car firmware version from 2016.9) 4. For Mercedes NTG5.1 via OBD2 A-Class W176 12.2015+ B-Class W246 12.2015+ CLA-Class W117 12.2015+ GLA-Class W156 12.2015+ GLE-Class W166 01.2016+ GLE Coupe W292 01.2016+ GLE-Class X166 01.2016+ CLS-Class W218 01.2016+ 5. Instruction: (1). Turn on the car ignition switch (2). NTG5 S1 device connected to the car OBD interface (3). Car display DIAG words, 10 seconds after the host restart (4). Remove the OBD NTG5 S1 device. And then connect the phone (preferably using the original charging cable) (5). End debugging,all is ok