Maserati Quattroporte 2004-2012 aftermarket radio upgrade headunit (free backup camera)

DAB is Digital Audio Broadcasting. Not available in the US. List of the countries below 

https://www.worlddab.org/countries

It can be easily fitted on the dashboard of the car or the windscreen (behind the rearview mirror). The dashboard camera records everything in front of the car.

Onboard Diagnostics II (OBD2) is a diagnostic system. It is used to check the engine and other vehicle systems and communicates with all the possible glitches that happen to them. OBD2 is a vehicle diagnostic tool that can be connected to the OBD port of the car under the steering wheel. It shows fault codes via an app at the head unit’s screen. 

https://www.sigmacarstereo.com/obd-ii-diagnosis-adapter

 How to connect OBD2 dongle
1. Connect the OBD2 adapter to the OBD port under the steering wheel.
2. Turn on the Wi-Fi of the stereo and connect it to the "OBD" WiFi signal.
3. Open the "Torque" app to use.Note that Wi-Fi OBD and wireless carplay do not work at the same time because the radio only connects to one device through Wi-Fi.