It's like vagcom, you get a cable that plugs in to all skoda/vw/audi/seat the cable then turns into wifi that then talks to your iPhone or android phone, there are 3 apps on iTunes (don't know about android) they cost between £25-£35 pound. Check codes, clear codes, see your revs speed, engine timing, engine temp, mpg. My new headunit supports that app I have so I can do everything from my headunit, in all the headunit, cable and app cost £400 all in