It is a 16 pin female port for reading from the car's ecu (diagnostics port) often called as OBD2 port. Gadgets like scangauge2 can be connected to this port and one can read a lot of information coming out of this port Like DTE, Engine RPM, MPG(Miles per gallon or KMPL) and etc. I too have a device like this but does not work on my Ritz VDi. Its called Kiwi MPG.Scangauge2 works on Ritz VDi. (seen it myself) If anybody is looking for a scangauge2 device trust me, it works on Ritz VDi.