The Carlinkit 5.0 CPC200-2Air Wireless CarPlay and Android Auto Adapter is compatible with a wide range of vehicle models, including many brands and models from before 2015.

- Compatibility: The adapter is compatible with over 600 car models, including some Mercedes models. However, it is important to check the specific compatibility with your Mercedes GLK JG 2015 as compatibility may vary depending on vehicle equipment and infotainment system.
- Screen: If your car has a black and white screen, there could be problems with the colour display, as the adapter normally supports colour displays. However, it is possible that the adapter still works, but the colour information cannot be displayed.

To make sure that the adapter is compatible with your specific vehicle model, I recommend checking the compatibility list on Carlinkit's official website or contacting customer service directly.