Plug Play Just need insert to obd port than active 1 to work use Connect mobile phone with car only via cable. Support Carplay and Android auto.(android auto only support car firmware version from 2016.9) Original Protocol Communication . For NTG5.1 via OBD2 Compatible models: A-Class W176 Date of manufacture from 01.2016 to 12.2017 B-Class W246 Date of manufacture from 01.2016 to 12.2017 E-Class W213 Date of manufacturefrom 01.2016 to 12.2017 CLA-Class W117 Date of manufacture from 01.2016 to 12.2017 GLA-Class W156 Date of manufacture from 01.2016 to 12.2017 -Class W166 Date of manufacture 01.2016 to 12.2017 Coupe W292 Date of manufacture 01.2016 to 12.2017 -Class X166 Date of manufacture 01.2016 to 12.2017 -Class W218 Date of manufacture 01.2016 to 12.2017 C/GLC/S Series NTG5.0 and NTG5E are not support (Need to use video interface and iponoe box to achieve.) If your headunit is old version, the function will not normal work or can not be opened, you need update your hedunit to latest version online. t insert this OBD tool for unsupported models, or you need take all consequences. Many Thanks. Operation Steps: 1.Turn on the car ignition switch 2.NTG5S1 device connected to the car OBD interface 3.Car display DIAG words, 10 seconds after the restart 4.Remove the OBD NTG5S1 device. And then connect the phone (preferably using the original charging cable) 5.End debugging,all is ok Material: ABS colour: black Package Contents: 1 x OBD2 Activation Tool Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.